US PATENT SUBCLASS 242 / 118.31
.~.~ Reinforcing feature
Current as of:
June, 1999
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242 /
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WINDING, TENSIONING, OR GUIDING
118
DF
BOBBIN OR SPOOL
{5}
118.3
DF
.~ Cop-tube type (i.e., headless or single-headed tube) {2}
118.31
.~.~ Reinforcing feature
DEFINITION
Classification: 242/118.31
(under subclass 118.3) Winding cores including means to strengthen the tube structurally.