US PATENT SUBCLASS 123 / 539
.~.~ Air only

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
536  DF  .~ Combustible mixture ionization, ozonation, or electrolysis {3}
539.~.~ Air only

DEFINITION

Classification: 123/539

Air only:

(under subclass 536) Subject matter wherein said means operates on the air for the charge only.