Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B66
HOISTING; LIFTING; HAULING
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B66C
CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
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5/00
Base supporting structures with legs
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B66C5/10
Portals, i.e. essentially circular or square platforms with three or more legs specially adapted for supporting slewing jib cranes
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