US PATENT SUBCLASS 341 / 177
.~ Producing different pulse frequencies

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341 /   HD   CODED DATA GENERATION OR CONVERSION

173  DF  CODE GENERATOR OR TRANSMITTER {8}
177.~ Producing different pulse frequencies

DEFINITION

Classification: 341/177

Producing different pulse frequencies:

(under subclass 173) Subject matter which generates coded pulses of different frequencies and in which the code is represented by the pulse frequency.