US PATENT SUBCLASS 112 / 229
.~.~ Bobbin tensioning

Current as of: June, 1999
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112 /   HD   SEWING

270  DF  ELEMENTS {21}
228  DF  .~ Revolving hooks {3}
229.~.~ Bobbin tensioning

DEFINITION

Classification: 112/229

Includes tension means for the bobbin.