Title:
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United States Patent 2821580
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Inventors:
Black, George S.
Publication Date:
01/28/1958
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Assignee:
Black, George S.
Primary Class:
200/17R
Other Classes:
200/14, 200/16A, 200/11D
International Classes:
H01H19/58; H01H19/00
Foreign References:
GB601640A