Title:
MACHINE KEY STRUCTURE
United States Patent 3428343
US Patent References:
/0408835.html
- - 0408835

/0867468.html
- - 0867468


Inventors:
Downie, Robert R.
Publication Date:
02/18/1969
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Assignee:
Robert, Downie R.
Primary Class:
403/358
International Classes:
F16B3/00; F16D1/08; F16D1/06; F16D1/08




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