Inventor: Hughes, J. Wilson
Inventor: Brackett, Leroy W.
Inventor: Christensen, Jack E., Ellis, Arnold W.
Inventor: Merrill, deceased, Grant, Merrill, executrix, by Lucille B.
Inventor: Merrill, deceased, Grant, Merrill, executrix, by Lucile B.
Inventor: Zaiger, Chris F.
Inventor: Van Well, Peter J.