Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[1]research packet 1069-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERDICT: VERIFIED (thin sourcing)
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERDICT: VERIFIED (thin sourcing)
- Evidence ID
- uss-yms-429-yms429-pkt-1069-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-429 page - construction timeline, specifications, commissioning officer, disposition, post-Navy civilian trail [other_primary]
- Locator
- NavSource 11/19429.htm header block, specifications block, DANFS note
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: 'YMS-1 Class Auxiliary Motor Minesweeper'; call sign Nan-Queen-Mike-Sugar; laid down 27 March 1944 by Mojean and Erickson, Tacoma, WA; launched 30 September 1944; 'Completed 16 March 1945 and commissioned under the command of LTJG George A. Stark, USNR'; 'Decommissioned 1 December 1946'; 'Struck from the Naval Register 25 February 1947'; 'Transferred to the War Shipping Administration 23 January 1948 and sold'; 'Acquired in 1949 by World-Wide Fishing, Inc. of Puyallup, WA for use as a fishing boat and named Princess La Verne'; 'Operated in 1953 under the Peruvian flag'; 'Fate unknown.' Specifications: displacement 270 t.; length 136'; beam 24' 6"; draft 8'; speed 15 kts.; complement 32; armament one 3"/50 dual purpose gun mount, two 20mm mounts, and two depth charge projectors; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. Page states 'There is no DANFS History currently available for YMS-429' and no photograph is held.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1953
- Population
- Tacoma yard construction trades (1944); crew (1945-47); post-sale civilian owners/operators (1948-)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates generally track official records and are corroborated here by uboat.net, the awards manual, NHHC fleet organization, and Special List 44. 'Completed 16 March 1945' is read as the in-commission date (consistent with uboat.net 'Commissioned' and the SL44 log-coverage start). Contains no asbestos content. The WSA-transfer wording is loose - WSA was abolished 1 September 1946, so a January 1948 disposal ran through the successor U.S. Maritime Commission channel (see ev-09).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-01
-
[3]uboat.net Allied Warships, USS YMS-429 (YMS-429) - build milestones and disposal (secondary compilation) [other_primary]
- Locator
- uboat.net ship/9848 data table
- Finding type
- vessel_history
- Finding
- uboat.net record for this hull: built by Mojean and Ericson Shipbuilding Corp. (Tacoma, Washington); ordered 21 July 1943; laid down 27 March 1944; launched 30 November 1944; commissioned 16 March 1945; 'Stricken on 25 February 1947'; 'Sold on 23 January 1948'. No events or commanding officers listed for the vessel.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1948
- Population
- Tacoma yard construction trades (1944); crew (1945-47)
- Limitations
- Secondary compilation - the only located source carrying an 'ordered' date (21 July 1943), which is otherwise uncorroborated. Its launch date (30 Nov 1944) conflicts with NavSource (30 Sep 1944) - carried as a gap. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-02
-
[4]National Archives, Special List 44 'List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947' - ship-number index (archives.gov PDF) [other_primary]
- Locator
- sl-44-ship-number.pdf, PDF page 121, 'YMS-429' row (137-page PDF)
- Finding type
- historical_record
- Finding
- Special List 44's ship-number index inventories US Navy deck logs for this hull: 'YMS-429 3/16/1945 12/31/1945'. Deck logs covering commissioning through 31 December 1945 therefore exist in NARA custody (RG 24 deck-log series, College Park).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-03-16 to 1945-12-31 (inventory coverage)
- Population
- Crew (1945 log window)
- Limitations
- The dates are log-coverage inventory dates, not asserted commissioning/decommissioning dates - the start coincides with commissioning, and the 31 December 1945 end does not mark end of service: the awards manual (ev-05) documents operations through 28 January 1946 and NavSource dates decommissioning 1 December 1946, so later logs exist but are not itemized for this hull in this index. The deck logs are paper records; the NARA online digitized-deck-log index lists no YMS-429 entry (numbered vessels appear there only under later names, and this hull was never named). PDF page 121 verified by direct download and text extraction.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-03
-
[5]NHHC (Navy Department Library), 'United States Pacific Fleet Organization, 1 May 1945' - fleet organization transcription [nhhc_danfs]
- Locator
- us-pacific-fleet-organization-1may1945.html - MINECRAFT, PACIFIC FLEET > Mine Squadron TWENTY > YMS roster, 'YMS 429' row
- Finding type
- vessel_history
- Finding
- The 1 May 1945 Pacific Fleet organization lists 'YMS 429' under MINECRAFT, PACIFIC FLEET (Commander Minecraft, Pacific Fleet: R. Adm. A. Sharp), within the YMS roster beneath Mine Squadron TWENTY (Commander Mine Squadron TWENTY: Capt. R. A. Larkin). Her row carries remark marker '(1)' and no task-force code or commanding-officer entry - the same '(1)' marker appears on the neighboring late-built hulls YMS-421, -423, -424, -426, -427, -428, and -430.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01 (organization date)
- Population
- Crew (spring 1945)
- Limitations
- Official fleet-organization document; it documents administrative listing on a single date (1 May 1945), not positions or operations. The document's footnote legend defining the '(1)' marker is not rendered on the live NHHC page - the marker is reported verbatim without interpretation. No commanding officer is printed for this hull (NavSource supplies LTJG George A. Stark at commissioning). Contains no asbestos content. history.navy.mil returns 404 to non-browser user-agents; the page was verified live via browser-agent fetch.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-04
-
[6]Navy and Marine Corps Awards Manual, NAVPERS 15,790 (Rev. 1953), Part IV, Section 2(16) - official list of ships eligible for engagement stars (HyperWar transcription of the government manual) [other_primary]
- Locator
- Awards-IV-16.html Part IV Section 2(16) ship-eligibility list, 'YMS 429:' entry (4 credited windows); Part III P207 sub-operation table (P207-14 Arcadia, P207-18 Fukuoka, P207-20 Fusan)
- Finding type
- vessel_history
- Finding
- The official Navy awards list credits YMS-429 with four engagement windows, all under P207 'Minesweeping Operations Pacific' (23 Jun 45 - 2 Mar 46; one star for participation in one or more): 1 Sep 45 - 5 Sep 45 under P207-14 (Arcadia, Kyushu-Korea Area, window 1-7 Sep 45); 18 Oct 45 - 21 Oct 45 under P207-18 (Fukuoka, Kyushu-Korea Area, window 13 Oct 45 - 11 Jan 46); 3 Nov 45 - 27 Dec 45 under P207-18 (Fukuoka); and 13 Jan 46 - 28 Jan 46 under P207-20 (Fusan, Kyushu-Korea Area, window 28 Sep 45 - 29 Jan 46). These are post-surrender clearance operations of Japanese/Korean-area minefields.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-1946 (credited operations); manual published 1953
- Population
- Crew during post-surrender Japanese/Korean home-waters mine clearance (Sep 1945 - Jan 1946)
- Limitations
- An award-eligibility list, not a unit history: it documents credited participation windows, not day-by-day activity, position, or task organization. The Naval History Division flagged hundreds of entry errors in this manual for other operations in 1950s correspondence; YMS-429's entries are not individually challenged. Dates and P207 code-to-name mappings verified in the downloaded transcription text (Part IV list entry and Part III P207 sub-operation table). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-05
-
[7]Era inference built on: NavSource specifications (2 x GM 8-268A diesels, Snow & Knobstedt gear, 2 shafts; YMS-1 class); class literature (wooden hulls built at 35 yacht/boat yards); GAO HRD-80-2 Navy asbestos-use era documentation (ev-07) [other_primary]
- Locator
- NavSource 11/19429.htm specifications block; NavSource 11/19idx.htm class index; shipyards.json has no Mojean & Ericson entry
- Finding type
- asbestos_application
- Finding
- A wooden-hulled diesel-powered auxiliary minesweeper completed March 1945 sits inside the Navy's documented asbestos-use era. Era-standard applications aboard a small diesel combatant of this type were diesel-exhaust lagging and machinery insulation in the engine space, gaskets and valve packing throughout piping systems, electrical insulation and panelboard, and brake linings on the sweep winch and windlass. As a diesel vessel with a wooden hull she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply, and her asbestos loading would be materially lighter than a steam vessel of the era.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1944-1948
- Population
- Tacoma construction trades (1944); engine-room and repair-rated crew (1945-47); disposal/shipbreaking trades post-1948
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or abatement record located for YMS-429. Names era-standard applications, not confirmed installed materials. No quantity. Product names are normalized era terms; no manufacturer attribution for this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-06
-
[8]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire construction (1944) and service era (1945-47).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, confirmed 2026-10-04) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-07
-
[9]Shipbuilding History (T. Colton), Mojean & Ericson yard page (Tacoma WA) - yard history and hull-by-hull production table; identical table mirrored at Naval Marine Archive (navalmarinearchive.com) [other_primary]
- Locator
- shipbuildinghistory.com Mojean & Ericson yard table, YMS 429 row; navalmarinearchive.com/sbh/shipyards/emergencysmall/mojean.html (identical table)
- Finding type
- vessel_history
- Finding
- Builder context: William Mojean and Olaf Ericson started the yard in 1925 and closed it at the end of the war; it stood at the extreme inland end of the Thea Foss Waterway, on East D Street between Dock Street and South 21st, Tacoma. The yard table lists YMS 429 with U.S. Official Number 258428, delivery 16-Mar-45, and disposition 'Sold 1947 as Princess Laverne, wrecked in Everett and scrapped' - alongside wartime builds YMS 222-225, PCS 1455-1456, and YMS 426-428 (of which YMS 428 went to the USSR as T-525 in 1945).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1948 (build window); yard history 1925-1945
- Population
- Tacoma yard construction trades (1944); post-sale fishing/civilian trades (1948-)
- Limitations
- Secondary compilations - Colton's list and the Naval Marine Archive page carry identical table data (shared underlying compilation). The 'Sold 1947 ... wrecked in Everett and scrapped' disposition conflicts in detail with NavSource (transferred/sold 23 Jan 1948; 1949 World-Wide Fishing; 1953 Peruvian flag; 'fate unknown') - see ev-09 and gaps. The Official Number 258428 is the merchant-registry number carried post-sale. Contains no asbestos content; no yard-level asbestos documentation exists for this small yacht/boat yard (contrast: NIOSH-surveyed yards like Electric Boat).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-08
-
[10]Disposition and milestone cross-check: NavSource 11/19429.htm; uboat.net ship/9848; shipbuildinghistory.com / navalmarinearchive.com Mojean & Ericson yard table [other_primary]
- Locator
- NavSource header disposition lines; uboat.net 'History' field; shipbuildinghistory.com/Naval Marine Archive Mojean table disposition column
- Finding type
- historical_record
- Finding
- THREE CONFLICTS carried rather than resolved: (1) Launch date - NavSource prints 30 September 1944, uboat.net prints 30 November 1944; the yard table gives delivery 16-Mar-45 only. (2) Disposal wording - NavSource 'Transferred to the War Shipping Administration 23 January 1948' uses loose wording: WSA was abolished 1 September 1946, so a January 1948 disposal was administered by the successor U.S. Maritime Commission; uboat.net dates the same event 'Sold on 23 January 1948' and the yard table 'Sold 1947'. (3) Final fate - NavSource: 'Fate unknown' after 1953 Peruvian-flag operation; yard table: 'wrecked in Everett and scrapped' - unreconciled.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1946-1953 (disposition window)
- Population
- Disposal/shipbreaking or civilian-owner trades post-1948
- Limitations
- No registry-level document was located for the striking or disposal event (NVR excludes vessels disposed before 1987; no NVR entry exists; no DANFS entry exists). The discrepancy between the Peruvian-flag operation in 1953 and a wreck/scrapping in Everett is unexplained - possibly sequential (returned to U.S. registry then wrecked) or a table error. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-09
-
[11]Batch-9069 search ledger (this record): NavSource; uboat.net; NARA Special List 44 ship-number PDF (p.121 verified); NARA online deck-log index; NAVPERS 15,790 (HyperWar transcription); NHHC Pacific Fleet organization 1 May 1945; shipbuildinghistory/Naval Marine Archive Mojean & Ericson yard page; GAO product page; CourtListener (paced out - blocked); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-429-yms429-01 through -13
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming USS YMS-429 was found in the public sources searched. CourtListener: exact-phrase searches 'YMS-429' (opinion index and docket index) and 'USS YMS-429' (docket index) each returned 0 results - verified negatives on both indexes. The 'USS YMS-429' opinion query paced out on the shared fleet budget (~58/hr across sessions) - logged as blocked, not a negative result, and bounded: it is a strict subset of the completed 'YMS-429' opinion query (any document containing 'USS YMS-429' necessarily contains 'YMS-429', which returned 0). Secondary web sweeps surfaced no qualifying case and no hull-specific 'asbestos aboard' page for YMS-429 (generic asbestos-ship listicles exist - excluded by source policy).
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. Three of four CourtListener base queries are verified negatives; the name-opinion query is bounded by the hull-opinion negative but was not itself run - a residual, formally open sliver of the opinion index. The 3/16/1945-12/31/1945 deck logs, builder construction records, and any 1948 disposal/survey files are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-429-yms429-10