United States Patent 3119588
Inventors:
Keats, John B.
Publication Date:
01/28/1964
Other Classes:
40/607.04, 40/607.1, 40/617, 116/63P, 116/173, 248/519, 248/910, 256/1, 256/64, 482/17, D20/41
International Classes:
E01F9/012; E01F13/02; G09F17/00; E01F9/011; E01F13/00; G09F17/00