Samuel A. Groff developed the street letter box fastener. He was born 3 April 1847 in Manheim, Lancaster County, Pennsylvania. He lived with his parents and siblings in Manheim, Lancaster County, Pennsylvania in 1850.
In 1860 he lived with his father, stepmother and siblings in Mount Joy Township, Lancaster County, Pennsylvania.
Samuel, originally from Pennsylvania, was a collector of fines with the Police Court since 1885 in Washington, DC. Around 1896, he came up with an improved method of fastening the letterboxes along city streets.
He invented such a fastener and received a patent for street letter box fasteners which could then be sold to the U.S. Postal Office.
Samuel possessed considerable talent for mechanics. Among his inventions were a projectile, a safeguard for streetcars, a device for catching crabs and a street indicator.
In 1900 he, his wife Louisa, and son John lived in the District of Columbia.
He died 7 January 1907 in Washington, D.C. and was buried in Rock Creek Cemetery, Washington, District of Columbia, District Of Columbia.
Find A Grave', database and images (https://www.findagrave.com : accessed 13 July 2019), memorial page for Samuel A. Groff (3 Apr 1847–7 Jan 1907), Find A Grave Memorial no. 138947125, citing Rock Creek Cemetery, Washington, District of Columbia, District Of Columbia, USA ; Maintained by John Rentz (contributor 46781289) .
United States Census, 1850, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4HL-ZMC : 12 April 2016), Samuel Groff in household of Sam*L Groff, Manheim, Lancaster, Pennsylvania, United States; citing family 277, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
United States Census, 1900, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMFW-KHJ : accessed 14 July 2019), Saml A Groff, Washington city, Washington, District of Columbia, United States; citing enumeration district (ED) 116, sheet 19A, family 284, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,163.
District of Columbia Deaths, 1874-1961, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F7RP-392 : accessed 14 July 2019), Samuel A. Groff, 07 Jan 1907, District of Columbia, United States; citing reference ID 171296, District Records Center, Washington D.C.; FHL microfilm 2,115,236.