US PATENT SUBCLASS 123 / 567
.~ Oxidant is solely oxygen


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123 /   HD   INTERNAL-COMBUSTION ENGINES

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
567.~ Oxidant is solely oxygen


DEFINITION

Classification: 123/567

Oxidant is solely oxygen:

(under subclass 434) Subject matter wherein the fuel (which may be a gas) is mixed or burned solely in oxygen and no gas other than fuel or oxygen is present.