US PATENT SUBCLASS 200 / 61.21
.~.~ Fluent solid bin or hopper

Current as of: June, 1999
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200 /   HD   ELECTRICITY: CIRCUIT MAKERS AND BREAKERS

52 R  DF  SPECIAL APPLICATION {25}
61.2  DF  .~ Container contents level responsive {1}
61.21.~.~ Fluent solid bin or hopper

DEFINITION

Classification: 200/61.21

(under subclass 61.2) Devices in which the said element responds to the volume within the said receptacle of particulate nonfluid material.