US PATENT SUBCLASS 73 / 47
.~.~.~ Piston, piston ring, or engine valve

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

37  DF  WITH FLUID PRESSURE {8}
40  DF  .~ Leakage {8}
46  DF  .~.~ Between fitted parts (e.g., joints) {2}
47.~.~.~ Piston, piston ring, or engine valve

DEFINITION

Classification: 73/47

(under subclass 46) Subject matter for leakage testing of engine heads, i.e., any one or any combination of valve, piston or piston ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

119+, for miscellaneous tests of engine parts.