US PATENT SUBCLASS 212 / 257
.~ And trolley

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

255  DF  HAVING VERTICALLY SWINGING BOOM {6}
257.~ And trolley

DEFINITION

Classification: 212/257

And trolley:

(under subclass 255) Apparatus wherein the vertically swinging boom* serves as or bears a separate track or guide on which a load-supporting trolley* is adapted to move.

SEE OR SEARCH THIS CLASS, SUBCLASS:

225+, for a horizontally and vertically swinging boom having a trolley thereon.

346+, for trolley structure, per se.