US PATENT SUBCLASS 112 / 278
.~ Thread sensing

Current as of: June, 1999
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112 /   HD   SEWING

270  DF  ELEMENTS {21}
278.~ Thread sensing

DEFINITION

Classification: 112/278

Thread sensing:

(under subclass 270) Devices which sense a condition of the sewing thread, such as slackness, breakage or run out, and activate a signal generator in response to the condition sensed.