US PATENT SUBCLASS 73 / 40.7
.~.~ By probe gas, vapor, or powder

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

37  DF  WITH FLUID PRESSURE {8}
40  DF  .~ Leakage {8}
40.7.~.~ By probe gas, vapor, or powder

DEFINITION

Classification: 73/40.7

(under subclass 40) Subject matter wherein a probe gas, smoke, vapor or powder is applied to a specimen and its escape or penetration is detected.