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MASTELLIS, HELEN was born 23 May 1903, received Social Security number 186-09-7655 (indicating Pennsylvania) and, Death Master File says, died June 1979
Source: Death Master File (public domain). Check
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MASTELLIS, STEPHEN was born 30 April 1909, received Social Security number 125-12-5822 (indicating New York) and, Death Master File says, died November 1986
Source: Death Master File (public domain). Check
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MASTELLIS, STEPHEN R. was born 11 November 1939, received Social Security number 168-32-3685 (indicating Pennsylvania) and, Death Master File says, died 31 July 1998
Source: Death Master File (public domain). Check
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