United States Patents
Dave Gaston Started in the industry 1958
Conforms, Robert Westerlund, Herb Westerlund and Bob Siderits 1969
George Macarr and Duane O. Perrin 1964
Putzmeister Organization Celebrates 50 years in 2008
Thomsen 740
Richard Bennett and Marvin Bennett Interview 1954 to 1976
The PumpCrete by Rexnord or Chain Belt is believed to be the worlds first Concrete Pump 1930