DeDiemar is the holder or coholder of 13 U.S. patents covering products such as jaw crushers, cone crushers, gravel scrubbers and apron feeders. His career included stops at several equipment manufacturing companies, including Allis-Chalmers Manufacturing Co., the Smith Engineering Works/Telsmith Division of Barber Greene Co., Protech and W.S. Tyler.

Additionally, DeDiemar served as a consultant during stretches of his career, including at Cal-Mar Technology, which he established in 1995. DeDiemar also served California Screen & Conveyor, a processing equipment distributor, as a sales consultant and principal
throughout most of the 2000s.