US PATENT SUBCLASS 212 / 256
.~ And compensating means to maintain horizontal movement of load

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

255  DF  HAVING VERTICALLY SWINGING BOOM {6}
256.~ And compensating means to maintain horizontal movement of load

DEFINITION

Classification: 212/256

And compensating means to maintain horizontal movement of load:

(under subclass 255) Apparatus wherein means are provided to keep the load at the same vertical distance above a surface as it is moved across the surface by the vertically swinging boom*.