US PATENT SUBCLASS 123 / 282
.~.~ Figure of revolution is multishaped to form a precombustion chamber

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123 /   HD   INTERNAL-COMBUSTION ENGINES

253  DF  PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES {22}
281  DF  .~ Precombustion chamber shape is a figure of revolution {3}
282.~.~ Figure of revolution is multishaped to form a precombustion chamber

DEFINITION

Classification: 123/282

Figure of revolution is multishaped to form a precombustion chamber:

(under subclass 281) Subject matter wherein the three-dimensional shape of the prechamber can be formed by rotating a plurality of separated planar shapes through 360 deg. about an axis.

(1) Note. The resulting separate volumes generally have an interconnecting passage.