US PATENT SUBCLASS 307 / 129
.~.~.~ Frequency

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

112  DF  SWITCHING SYSTEMS {5}
116  DF  .~ Condition responsive {4}
125  DF  .~.~ Electrical {6}
129.~.~.~ Frequency

DEFINITION

Classification: 307/129

(under subclass 125) Subject matter in which the electrical condition, to which the system is automatically responsive, is frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

73, for this subject matter.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

182+, for miscellaneous relay systems which are automatically responsive to frequency.