US PATENT SUBCLASS 212 / 253
.~ Having specific bearing structure

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

223  DF  HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
253.~ Having specific bearing structure

DEFINITION

Classification: 212/253

Having specific bearing structure:

(under subclass 223) Apparatus wherein significance is attributed to that structure at or adjacent the immediate area of contact between the boom* and the support on which the boom is swingably mounted.