Extensible platform
United States Patent 1947647

Inventors:
Holden, John K.
Publication Date:
02/20/1934
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Assignee:
Holden, John K.
Primary Class:
182/141
Other Classes:
182/63.100, 52/109, 182/69.500
International Classes:
B66F3/22; F16M11/38; B66F3/00; F16M11/20