US PATENT SUBCLASS 123 / 90.23
.~.~ Intake and exhaust

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

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.22  DF  .~ Plural valve trains, single actuator {1}
90.23.~.~ Intake and exhaust

DEFINITION

Classification: 123/90.23

(under subclass 90.22) Device wherein the two or more valves control the intake and the exhaust passages of the cylinder.