US PATENT SUBCLASS 123 / FOR 102
.~ Vacuum timing control (123/407)

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

FOR 101  DF  SPARK IGNITION TIMING CONTROL (123/406) {16}
FOR 102.~ Vacuum timing control (123/407) {4}
FOR 103  DF  .~.~> Multiple diaphragms (123/408)
FOR 104  DF  .~.~> Fluid delay in fluid path line from vacuum source (123/409)
FOR 105  DF  .~.~> Including sensor responsive to barometric pressure to alter vacuum level (123/410)
FOR 106  DF  .~.~> Increasing vacuum retards the spark (123/411)

DEFINITION

Classification: 123/FOR.102

Vacuum timing control:

Subject matter in which the motor or other means controlling the timing uses a vacuum as its motive or actuating power source.