Notes:
Data source is "The Mumma Family" by Samuel H. Mumma 1962 & Moomaw book 1990
The Brenneman History by Albert H. Gerberich, 1938 p. 76
1920: Harrisburg Ward 9, Dauphin, Pennsylvania
1730 Market Street
Martin L Mumma 38, auto dealer, automobile company
Nellie E Mumma 30
1930: Harrisburg, Dauphin, Pennsylvania, USA
1707 Second Street.
Martin L Mumma 48, automobile sales manager
Nellie M Mumma 41
Thomas J Beck 73
Christiana Beck 75
1940: Harrisburg, Dauphin, Pennsylvania
1707 N Second Street
Residence in 1935: Same House
Martin Mumma, head, 57, propriater, auto agency
Nellie Mumma, wife, 51
Mary Mumma, sister, 54, single
Russel Snavely, nephew, 33, single, manager, auto service station
Thomas J Beck, father-in-law, 83, widowed