Extendable mast
United States Patent 2793717
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Inventors:
Camburn, Elwyn A.
Publication Date:
05/28/1957
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Assignee:
CAMBURN SALES & MFG CORP
Primary Class:
403/81
Other Classes:
403/109.500, 403/104, 254/107
International Classes:
E04H12/18; E04H12/00
US Patent References:
1110961
1154687
1349576Adjustable jack or shore
1901726Scaffold
2065715Convertible mast construction
2092669Shock-absorbing pedestal
2174321Jack
2194386Insulating pole