Data source is "The Mumma Family" by Samuel H. Mumma 1962 & Moomaw book 1990
The Pennsylvania Supply Company was started by Walter Mumma in 1921 to provide quality building materials to contractors in Dauphin and Cumberland Counties. For many years, Pennsy was a small and successful family business. In the 1940's, Walter's son, Robert M. Mumma, began moving Pennsy into new and exciting areas that helped the company grow. Pennsy started purchasing quarries and producing aggregate, expanding into new territories and offering new services. It was a formula for success. Today, Pennsy has over 400 employees offering a range of construction products and services to customers across South Central Pennsylvania.
The family even owned a railroad car which was donated when Robert died.
http://nrhs-hbg.pennsyrr.com/Preservation/Cabin_car/description.ws4d
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The Philadelphia Inquirer, Tuesday, April 15, 1986:
Robert M. Mumma, 71, a prominent businessman and former Pennsylvania secretary of commerce, died Saturday at his farm in Amity Hall, Perry County. He lived in Wormleysburg, across the Susquehanna River from Harrisburg.
Long active in Republican political affairs, he was considered a gubernatorial prospect in the early 1970s and served as a delegate to the Republican National Convention in 1976.
He was appointed to the commerce post in 1969 by Gov. Raymond P. Shafer and was favored by Shafer to succeed him in office. Mr. Mumma resigned after 10 months to devote more time to his private interests and to test the political waters. They were not favorable. Raymond P. Broderick won the GOP nomination in 1970 and was defeated by Democrat Milton J. Shapp.
Mr. Mumma was president of the Pennsy Supply Co., a supply house for contractors that was founded by his father.
He was interested in breeding and racing horses. He was former treasurer and member of the board of directors of the U.S. Trotting Association.
His horses twice won the Hambletonian, known as the crown jewel in the triple crown of harness racing.
A lifelong resident of the Harrisburg area, he could trace his ancestry to 1752, when Johann Mumma settled in Swatara Township near Harrisburg. His father, Walter Mumma, was long active in politics and was a member of the U.S. House. His great-grandfather, Isaac Mumma, was a judge on the Dauphin County Court bench.
Mr. Mumma was a past president of the Harrisburg Area Chamber of Commerce and of the Harrisburg Builders Exchange. He was a former chairman of the Tri- County United Way fund drive. He served on the boards of a variety of businesses and charitable groups. He was a Mason and Shriner.
He was a 1936 graduate of Franklin and Marshall College in Lancaster and served in the Army in World War II. He was discharged with the rank of lieutenant colonel.
He is survived by his wife, Barbara; a son, Robert M. 2d, and three daughters, Barbara, Linda and Lisa.