United States Patent 2076604
Inventors:
Watson, John M.
Publication Date:
04/13/1937
Other Classes:
106/271, 510/268, 510/256, 206/526, 51/294, 51/306, 206/820, 51/305, 510/396, 15/118, 106/10, 510/400, 206/361
International Classes:
B24D15/04; B24D15/00