US PATENT SUBCLASS 440 / 18
.~.~ Piston and cylinder

Current as of: June, 1999
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440 /   HD   MARINE PROPULSION

13  DF  OSCILLATING PROPELLING MEANS {3}
17  DF  .~ Having nonpropelling cycle segment {3}
18.~.~ Piston and cylinder

DEFINITION

Classification: 440/18

Piston and cylinder:

(under subclass 17) Device wherein the propelling means is a fluid motor, the return stroke normally being the nonpropelling cycle portion.