Tower raising mechanism
United States Patent 2887191

Inventors:
Jack, Lovell
Publication Date:
05/19/1959
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Assignee:
CHICAGO PNEUMATIC IND INC
Primary Class:
52/115
Other Classes:
52/119, 14/36
International Classes:
E04H12/18; E04H12/34; E21B15/00; E21D17/02; E04H12/00; E21D17/00
Foreign References:
FR52541A