US PATENT SUBCLASS 123 / 256
.~ Plural precombustion chambers

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123 /   HD   INTERNAL-COMBUSTION ENGINES

253  DF  PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES {22}
256.~ Plural precombustion chambers

DEFINITION

Classification: 123/256

Plural precombustion chambers:

(under subclass 253) Subject matter in which more than one prechamber is provided.

(1) Note. They may empty separately into the main chamber, serially into each other then into the main chamber, or both.