Title:
Crown block safety switch
Document Type and Number:
United States Patent 2575627
Inventors:
Johnson, Glenn D.
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Sponsored by: Flash of Genius |
Publication Date:
11/20/1951
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Referenced by:
Export Citation:
Assignee:
BAASH ROSS TOOL COMPANY
Primary Class:
Other Classes:
200/85R
International Classes:
E21B19/02; H01H3/16; E21B19/00
Foreign References:
| GB250922A |