US PATENT SUBCLASS 123 / 188.3
.~.~.~ Material or structure

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

188.1  DF  VALVE {10}
188.4  DF  .~ Reciprocating valve {3}
188.2  DF  .~.~ Poppet {2}
188.3.~.~.~ Material or structure

DEFINITION

Classification: 123/188.3

Material or structure:

(under subclass 188.2) Apparatus having specific substance, or arrangement (e.g., ceramic) of the valve.