United States Patent 3525493
Inventors:
Chrietzberg, Bill G.
Newell, Frank V.
Publication Date:
08/25/1970
Assignee:
BEST STAMP & MFG CO
Other Classes:
40/607.13, 40/658, 248/229.11
International Classes:
F16B5/06; G09F7/18; F16B5/06; G09F7/18; (IPC1-7): G09F7/18