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Edwin Isaac Groff (1909 - 1985)

Edwin Isaac Groff
Born in Berks County, Pennsylvania, USAmap
Ancestors ancestors
Husband of — married 12 May 1944 in West Reading, Berks, Pennsylvania, United Statesmap
[children unknown]
Died at age 76 in Womelsdorf, Berks County, Pennsylvania, USAmap
Profile manager: J.t. Ussery private message [send private message]
Profile last modified | Created 1 Apr 2009
This page has been accessed 832 times.


Edwin I. Groff patented the first commercially successful automatic pretzel twisting machine and founded Reading Pretzel Machinery, the forerunner of Reading Baking Systems, in 1947.

His machine was designed to manufacture spiral pretzels very uniform and quickly, which results in rapid overall production.

He is the son of Edwin C. Groff and Alberta Haas.

He married Kathryn S. Trostle [1] who died in March 1997, and is survived by a son, E. Terry.


  1. "Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch ( : 23 September 2017), Edwin I. Groff and Kathryn S. Trostle, 12 May 1944; citing Marriage, West Reading, Berks, Pennsylvania, United States, various county courts and registers, Pennslyvannia; FHL microfilm 2,080,488.
  • "United States Census, 1910," database with images, FamilySearch ( : accessed 18 July 2020), Edwin I Groff in household of Edwin C Groff, Penn, Berks, Pennsylvania, United States; citing enumeration district (ED) ED 44, sheet 1B, family 13, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1313; FHL microfilm 1,375,326.
  • "Pennsylvania Obituaries, 1977-2010," database with images, FamilySearch ( : 17 March 2018), Edwin I Groff in entry for Kathryn S Groff, 1997; citing Pennsylvania, United States, Old Buncombe County Genealogical Society, Asheville.

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Making of pretzels
Making of pretzels

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