US PATENT SUBCLASS 212 / 228
.~.~ And means acting independently of hoist mechanism to shift trolley

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

223  DF  HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
225  DF  .~ Having trolley thereon {3}
228.~.~ And means acting independently of hoist mechanism to shift trolley

DEFINITION

Classification: 212/228

And means acting independently of hoist mechanism to shift trolley:

(under subclass 225) Apparatus including means other than load-lifting means for moving the trolley* along the guideway.