circa 1960 – 1979
Helmick, William K.
1970s
Knoedler, Bob
1970s
Beasley, Michael
1970s
1970s
September 21 – December 20 1971
February 19 1971
Steinbrecher, Harold F.
February 19 1971
Steinbrecher, Harold F.
November 22 1971
Steinbrecher, Harold F.
July 21 1970 – July 31 1971
Myhrum, Arthur
May 24 1971
Kroeschell Engineering Co., Myhrum, Arthur
April 21 1971
Kroeschell Engineering Co., Myhrum, Arthur