US PATENT SUBCLASS 212 / 123
.~.~ Pulley changers

Current as of: June, 1999
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212 /   HD   TRAVERSING HOISTS

71  DF  OVERHEAD {7}
76  DF  .~ Cable {8}
123.~.~ Pulley changers

DEFINITION

Classification: 212/123

Pulley changes:

(under subclass 76) Details of cable hoists comprising a track, a pulley, pulley supports at two points along the track, and means for changing or shifting the pulley from one support to the other.