Evidence
12 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-12).
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[1]research packet 1065-packet.md (4 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED. Two independent shipyard-history sources record
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-407-yms407-pkt-1065-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-407 - construction/milestone record, specifications, commanding officer, NHHC photo caption [other_primary]
- Locator
- NavSource 11/19407.htm header block, specifications block, commanding-officer table, photo caption (NH 79710)
- Finding type
- vessel_history
- Finding
- YMS-1 class auxiliary motor minesweeper: laid down 21 April 1943 by Henry C. Grebe and Co., Chicago, IL; launched 16 September 1943; completed 8 December 1943; decommissioned 27 June 1946 at Seattle, WA; struck from the Naval Register 31 July 1946; transferred to the War Shipping Administration 19 February 1947 and sold; fate unknown. Spec block: displacement 270 t., length 136', beam 24'6", draft 8', speed 15 kts, complement 32; armament one 3"/50 dual-purpose mount, two 20mm mounts, two depth-charge projectors; propulsion two 880 bhp General Motors 8-268A diesel engines, Snow and Knobstedt single-reduction gear, two shafts. Commanding officer listed: LT F. S. Osborne, USNR (1945). Call sign Nan-Peter-Jig-Baker. Page states: 'There is no DANFS History currently available for YMS-407.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Grebe construction trades (1943, Chicago); crew (1943-1946); WSA disposal handlers (1947)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates track NVR/DANFS conventions but no DANFS entry exists for this hull to cross-check against. 'Completed' wording differs from uboat.net's 'commissioned' for the same 8 Dec 1943 date (see gaps). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-01
-
[3]National Archives Special List 44, List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (Bradley, Kurtz et al., comps., 1978), printed page 522 - YMS-407 logbook inventory entry (scanned page image via Allen County Public Library Genealogy Center mirror) [other_primary]
- Locator
- Special List 44 printed p. 522, 'Ships by Signal Number Designation' section, YMS-407 row (ACPL scan display image 554)
- Finding type
- historical_record
- Finding
- Special List 44 inventories deck logbooks held by the National Archives for this hull: two date spans are listed - 'Dec. 22, 1943-Feb. 29, 1944' and 'Mar. 1, 1944-June 30, 1945' - with 4 logbooks shown for the vessel. The inventory documents that WWII-era deck logs for YMS-407 exist in the archival record; the logs themselves are not digitized (the vessel does not appear on the NARA 'Navy Deck Logs Available in the National Archives Catalog' list). NOTE: the batch tasking cited 'PDF page 120' - in the ACPL page-image mirror the YMS-407 entry sits on printed page 522 (scan display 554); the coverage dates match the tasking's 12/22/1943-2/29/1944 but the printed entry additionally carries a second span through June 30, 1945.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1945 (log coverage); 1978 (inventory publication)
- Population
- Crew maintaining deck logs (Dec 1943 - Jun 1945)
- Limitations
- An inventory entry, not the logbooks themselves - establishes that logbooks were accessioned and held, not their contents. Log coverage ending 30 June 1945 does not mean service ended then (decommissioned June 1946); later logs are outside this inventory line or not accessioned in the same series. No asbestos content. Scanned page is the 1978 printed volume; 'PDF page 120' from batch tasking refers to a differently paginated digital rendering of the same publication.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-02
-
[4]The Coast Guard at War, Vol. V: Transports (U.S. Coast Guard official historical monograph), USS LST-761 entry (verbatim transcription via HyperWar/ibiblio) [other_primary]
- Locator
- USCG at War Vol. V, LST-761 (Flotilla 29 - Group 85 - Division 170) narrative paragraph
- Finding type
- historical_record
- Finding
- Ship-specific wartime movement documented: USS LST-761 'departed [San Pedro] in company with LST-784 and YMS's 407, 193 and 374' on 7 November 1944 and reached Pearl Harbor on 18 November 1944 - placing YMS-407 on the San Pedro-to-Pearl Harbor transit into Pacific service in November 1944.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-11-07 to 1944-11-18
- Population
- YMS-407 crew on Pacific transit (Nov 1944)
- Limitations
- Documents a convoy/transit association only - establishes the hull's presence on the San Pedro-Pearl Harbor passage, not her operations after arrival. The monograph entry is about LST-761; YMS-407 is mentioned as sailing in company. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-03
-
[5]NHHC, 'United States Pacific Fleet Organization, 1 May 1945' (fleet organization roster, Minecraft Pacific Fleet section) [other_primary]
- Locator
- Minecraft, Pacific Fleet section, YMS flat listing, row 'YMS 407'
- Finding type
- historical_record
- Finding
- On 1 May 1945 YMS-407 appears in the Minecraft, Pacific Fleet listing (Commander Minecraft, Pacific Fleet: R. Adm. A. Sharp; Minecraft is Task Force 18 in the document's tactical organization). Her row reads 'YMS 407 - Lt. F. S. Osborne (USNR)' with left-column code '94'. The commanding-officer name corroborates NavSource's CO listing (LT F. S. Osborne, USNR, 1945). Mine Division 94 is an attested Navy minecraft organization, but the document prints no legend for the left-column codes and the same '94' also appears beside a division header (MINE DIVISION TWENTY-NINE), so the precise meaning of the code on her row is not asserted here.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- Crew under LT F. S. Osborne, USNR (1945)
- Limitations
- Roster listing establishes administrative assignment and commanding officer as of 1 May 1945 - it does not state her physical location or operations on that date, and the '94' column code is unexplained in the document (interpretation left open; see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-04
-
[6]NHHC photographic record NH 79710, 'USS YMS-407 - In San Francisco Bay, 1945-1946. Courtesy of D.M. McPherson, 1974.' [other_primary]
- Locator
- NHHC online catalog record, NH Series > NH 79000 > NH 79710
- Finding type
- historical_record
- Finding
- Official NHHC photograph catalog entry documents this hull in San Francisco Bay in 1945-1946 (black-and-white photo, catalog NH 79710) - consistent with her Pacific service and West Coast return/inactivation (decommissioned at Seattle June 1946).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-1946
- Population
- Crew aboard during West Coast presence (1945-46)
- Limitations
- A photo catalog record only - establishes presence in San Francisco Bay in the stated window; does not document any work performed, maintenance, or materials aboard. Provenance year differs between sources: NHHC description says courtesy of D.M. McPherson 1974; NavSource caption says 1976. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-05
-
[7]uboat.net Allied Warships of WWII, USS YMS-407 (YMS-407) - order/milestone record [other_primary]
- Locator
- uboat.net ship page 9825, YMS-class minesweeper entry
- Finding type
- vessel_history
- Finding
- Corroborating milestone record: built by Henry C. Grebe Co., Chicago, Illinois; ordered 9 July 1942; laid down 21 April 1943; launched 16 September 1943; commissioned 8 December 1943; stricken 31 July 1946; sold 19 February 1947. No commanding officers are listed on the page.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1947
- Population
- Grebe construction trades (1942 order - 1943 build)
- Limitations
- uboat.net is an enthusiast-maintained reference compilation, not an official registry - used here only for the order-date and milestone corroboration against NavSource. 'Commissioned' wording for 8 Dec 1943 vs NavSource 'completed' (see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-06
-
[8]shipbuildinghistory.com, Henry C. Grebe & Company yard table (Chicago IL) - YMS-407 construction row; corroborated by Chicago Maritime Museum yard profile (28 minesweepers built by Grebe) [other_primary]
- Locator
- shipbuildinghistory.com Grebe yard table, YMS 407 row; chicagomaritimemuseum.org Henry C. Grebe profile
- Finding type
- vessel_history
- Finding
- The Grebe yard production table lists YMS-407 for the U.S. Navy, minesweeper, 320 tons / 136 ft, completed 8-Dec-43, 'Sold 1947' - matching NavSource milestones. The yard context: Henry C. Grebe & Co. was one of four Great Lakes yacht yards building the wooden-hulled YMS type; the Chicago Maritime Museum counts 28 minesweepers, 4 tankers and 21 tugboats built by Grebe for the war effort.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1947
- Population
- Grebe yard workers (1943)
- Limitations
- Secondary shipbuilding compilation - consistent with NavSource and uboat.net milestones but not a primary registry. Yard-table displacement shows 320 t vs NavSource 270 t (different measurement basis - light vs full load - unresolved variant; see gaps). No asbestos content; the yard itself is not in the Atlas shipyards.json dataset.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-07
-
[9]The Dashpot (Association of Minemen newsletter), 1992 issue, p. 13 - 'USS YMS 407' association listing, 224 Angelus Drive, Salinas, CA 93906; corroborated by American Legion Magazine reunion notices listing 'YMS-407' (Oct 1995, Nov 1996 issues) [reputable_press]
- Locator
- DP1992-2.pdf p. 13 association directory; archive.legion.org American Legion vol. 139 no. 4 and vol. 141 no. 5 reunion listings
- Finding type
- historical_record
- Finding
- A USS YMS-407 veterans' association/reunion organization existed in the 1990s - a point of contact listed in the Association of Minemen's Dashpot newsletter (Salinas, CA) and reunion notices carried in American Legion Magazine. This documents that the wartime crew of this hull organized postwar - relevant only to the existence and traceability of the crew population.
- Verification
- verified
- Role
- context
- Documentation level
- context_only
- Accessed
- 2026-10-04
- Study period
- 1992-1996 (association documentation); wartime crew period 1943-1946
- Population
- YMS-407 veterans (reunion community, 1990s)
- Limitations
- Newsletter/magazine directory listings only - no roster, service history, or exposure information was extracted; the scanned Dashpot PDF required page-level OCR. Not an asbestos record. The Salinas contact address dates the listing to 1992; reunion activity window per American Legion listings 1995-1996.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-08
-
[10]Era inference built on: NavSource YMS-407 spec block (two GM 8-268A diesels, two shafts - no steam plant); NavSource YMS class description (wood-hulled class, 481 built at 35 yacht yards); shipbuildinghistory Grebe table; GAO HRD-80-2 (ev-uss-yms-407-yms407-10) [other_primary]
- Locator
- NavSource 11/19407.htm spec block; NavSource 11/19idx.htm class description; shipbuildinghistory Grebe table
- Finding type
- asbestos_application
- Finding
- A wood-hulled diesel motor minesweeper built 1943 at a Chicago yacht yard sits inside the Navy's documented asbestos-use era. Era-standard applications aboard a small diesel craft of this type and period were engine-exhaust lagging, machinery gaskets and valve packing, electrical insulation, and incidental fireproofing/acoustic materials. The wood hull and absence of a steam plant mean the boiler/steam-line lagging pathway typical of larger combatants does not apply to this hull.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Grebe construction trades (1943); crew (1943-46); WSA disposal/shipbreaking chain (1947)
- Limitations
- Class/era inference only - no hull-specific material list, survey, or work package located for YMS-407. Names era-standard applications, not confirmed installed materials. No quantity. No manufacturer attribution. Asbestos presence aboard this hull is plausible era inference, not ship-proven.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-09
-
[11]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 (1943) and service era (1943-46).
- 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 returns HTTP 403 to automated fetch, confirmed 2026-10-04) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-10
-
[12]Batch-9045 search ledger (this record): NavSource ship page + YMS class index; NARA Special List 44 scanned inventory; NHHC photo catalog + Pacific Fleet organization roster; USCG at War Vol. V (HyperWar); uboat.net; shipbuildinghistory Grebe table; NARA digitized deck-log index; NHHC DANFS and NHMC awards list; CourtListener API v4 (opinion + docket); veterans' association listings (Dashpot/American Legion); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-407-yms407-01 through sl-uss-yms-407-yms407-12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or docketed asbestos case naming USS YMS-407 / YMS-407 was found in the public sources searched (see search_ledger). CourtListener authenticated API returned 0 results for all four base queries - 'USS YMS-407' and 'YMS-407' in both the opinion (type=o) and docket (type=r) indexes (hull-string queries landed on spaced retries after fleet pacing denials). No DANFS entry exists for this hull. Deck logs exist per Special List 44 but are undigitized. Secondary web sweeps surfaced no qualifying case and no law-firm marketing claims specific to this hull were located.
- 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 - era construction practice makes asbestos-containing components plausible but unproven for this hull. Undigitized NARA deck logs (4 logbooks, Dec 1943-Jun 1945) remain an open archival lead. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-407-yms407-11