Inventor: Nikolai J. Friesen
Inventor: Lester P. Pratt
Inventor: Wilton L. Staggs, Sam E. Staggs
Inventor: Duke, John F. Sr., Duke, Leman P.
Inventor: Peterson, Howard C.
Inventor: Dougherty, Harold D.
Inventor: Frye, Lloyd Louis
Inventor: Fulkerth, Carroll M.