(under subclass 9) Subject matter in which the effect of a lubricant upon the frictional drag between relatively movable solid bodies is determined, there being means for applying or maintaining the supply of lubricant.
(1) Note. These tests are usually termed tests of the lubricant.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7+, for "wear" tests involving application of a lubricant.
32+, for determination of specific gravity or density of lubricants.
53.01, for determination of viscosity of lubricants and other miscellaneous tests of lubricants. SEE OR SEARCH CLASS
434, Education and Demonstration, and Cryptography,
388, for lubricant demonstration devices not involving measuring or testing features.
