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Birth record www.genteam.at
Massachusetts, U.S., State and Federal Naturalization Records, 1798-1950 -- https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=2361&h=621...
Grave: https://www.findagrave.com/memorial/143242233/otto-e.-singer
Otto and Barbara did not have any children.