US PATENT SUBCLASS 307 / 152
.~ Rate of change responsive systems

Current as of: June, 1999
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307 /   HD   ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

149  DF  MISCELLANEOUS SYSTEMS {5}
152.~ Rate of change responsive systems

DEFINITION

Classification: 307/152

(under subclass 149) Subject matter automatically responsive to the rate of change of a system variable.

(1) Note. This system variable, for example, may be frequency or voltage.