US PATENT SUBCLASS 123 / FOR 123
.~ Having circuit that alters response of an oscillatory engine shaft position sensing circuit (123/428)

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123 /   HD   INTERNAL-COMBUSTION ENGINES

FOR 101  DF  SPARK IGNITION TIMING CONTROL (123/406) {16}
FOR 123.~ Having circuit that alters response of an oscillatory engine shaft position sensing circuit (123/428)

DEFINITION

Classification: 123/FOR.123

Having circuit that alters response of an oscillatory engine shaft position sensing circuit:

Subject matter in which the timing control means includes an oscillatory circuit responsive to the engine shaft position and further means to modify the position response of this circuit, to thereby adjust the ignition timing.