FamilySearch (ancestors.familysearch.org): 2026-10-06

URLs: https://ancestors.familysearch.org/en/LY5P-7C9/edwin-vincent-gray-1925-1990 (public summary, read in Chrome; reached from the son's public page). The /tree/ pages need sign-in, and no sign-in was attempted.

Found [web: URL above]

"Edwin Vincent Gray, Male, 8 January 1925 - 20 April 1990". "born on 8 January 1925, in Washington, District of Columbia ... his father, Francis Newell Gray, was 28 and his mother, Naomi Delosier Cole, was 25 ... He died on 20 April 1990, in Sparks, Washoe, Nevada ... and was buried in Riverside, Riverside, California."
Sources listed: "United States Census, 1930" (in household of Frances Cole); "Find A Grave Index"; "California Divorce Index, 1966-1984" (Edwin V Gray).
Siblings listed: 7 (the page shows 5 plus "+2 More"). Lindemann's biography says he was "one of 14 children". This is not necessarily a conflict, since the tree may be incomplete.
The identity match with the inventor is strong: Washington DC birth in 1925 and death in Sparks NV agree with Lindemann's biography, and the burial in Riverside agrees with the KeelyNet account. It is still a user-contributed tree. Living relatives are not recorded here.

Claim 5: this dates the death to 20 April 1990, not April 1989 (Lindemann) or April 1993 (KeelyNet 2000). The primary record to obtain is the Nevada death certificate (Washoe County), or an entry in the Nevada Death Index 1980-2012.