US PATENT SUBCLASS 212 / 235
.~.~ Including means for sluing boom as it is swung vertically

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

223  DF  HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
232  DF  .~ And vertically swinging {6}
235.~.~ Including means for sluing boom as it is swung vertically

DEFINITION

Classification: 212/235

Including means for sluing boom as it is swung vertically:

(under subclass 232) Apparatus wherein means are provided for simultaneously swinging the boom* about a vertical axis in response to the boom's movement about a horizontal axis.