US PATENT SUBCLASS 123 / FOR 106
.~.~ Increasing vacuum retards the spark (123/411)

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123 /   HD   INTERNAL-COMBUSTION ENGINES

FOR 101  DF  SPARK IGNITION TIMING CONTROL (123/406) {16}
FOR 102  DF  .~ Vacuum timing control (123/407) {4}
FOR 106.~.~ Increasing vacuum retards the spark (123/411)

DEFINITION

Classification: 123/FOR.106

Increasing vacuum retards the spark:

Subject matter wherein the actuating means acts to retard the ignition spark timing upon an increasing vacuum signal.