(under the class definition) Subject matter for testing surfaces and cutting edges for defects. The surface inspection includes such variations as soft spots, cracks,
fissures and other flaws not elsewhere classified.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40+, for leakage tests.
53.06, for lubricant testing by analyzing characteristics of a measuring surface.
64.48, for measuring the surface tension of a liquid.
SEE OR SEARCH CLASS 250, Radiant Energy,
302+, for methods of using fluorescent and radioactive tracer material to detect flaws.
324, Electricity: Measuring and Testing,
213, and 216 for flaw detection by magnetic tests.
356, Optics: Measuring and Testing,
2, for contour plotting, subclass 69 for cutting blade sharpness tests, and subclass 371 for flatness testing.
374, Thermal Measuring and Testing,
4+, for detection of flaws or leaks by thermal effects.
