US PATENT SUBCLASS 112 / 238
.~.~.~ With tension release

Current as of: June, 1999
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112 /   HD   SEWING

270  DF  ELEMENTS {21}
235  DF  .~ Presser devices {3}
237  DF  .~.~ Lifting {2}
238.~.~.~ With tension release

DEFINITION

Classification: 112/238

Releasing thread-tension when presser-bar is lifted.