US PATENT SUBCLASS 123 / 188.17
.~ Having actuation springs concentric with valve stem

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

188.1  DF  VALVE {10}
188.17.~ Having actuation springs concentric with valve stem

DEFINITION

Classification: 123/188.17

Having actuation springs concentric with valve stem:

(under subclass 188.1) Apparatus wherein a valve return spring encircles the valve stem and is centered around the same axis.