(under the class definition) Subject matter including a light source for shining light on a blade edge together with optical or photoelectric means for determining the reflectivity and thus the sharpness of the blade.
SEE OR SEARCH THIS CLASS, SUBCLASS:
445+, for reflection testing generally.
SEE OR SEARCH CLASS
73, Measuring and Testing,
104+, for testing surfaces and cutting edges where not elsewhere classified. 209, Classifying, Separating, and Assorting Solids,
511, 524+, 536, and 576+ for testing articles with radiant energy including means to sort the articles.
