230000014759maintenance of locationEffects0.000description1
230000004048modificationEffects0.000description1
238000012986modificationMethods0.000description1
239000007787solidSubstances0.000description1
238000003466weldingMethods0.000description1
Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B66—HOISTING; LIFTING; HAULING
B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes