US PATENT SUBCLASS 123 / 264
.~ Precombustion chamber is carried by a valve

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123 /   HD   INTERNAL-COMBUSTION ENGINES

253  DF  PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES {22}
264.~ Precombustion chamber is carried by a valve

DEFINITION

Classification: 123/264

Precombustion chamber is carried by a valve:

(under subclass 253) Subject matter in which the prechamber is attached to or formed as an integral part of an engine valve.