US PATENT SUBCLASS 356 / 955
MEASURING LINEAR OR ANGULAR SPEED UTILIZING DEVICES CHARACTERIZED BY THE USE OF OPTICAL MEANS, E.G., USING INFRA-RED, VISIBLE, OR ULTRA-VIOLET LIGHT (GO1P 3/36)

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356 /   HD   OPTICS: MEASURING AND TESTING

955MEASURING LINEAR OR ANGULAR SPEED UTILIZING DEVICES CHARACTERIZED BY THE USE OF OPTICAL MEANS, E.G., USING INFRA-RED, VISIBLE, OR ULTRA-VIOLET LIGHT (GO1P 3/36) {3}
956  DD  .~> Using a ring laser (GO1P 3/36B)
957  DD  .~> Using diffraction of light (GO1P 3/36C)
958  DD  .~> Using photographic means (GO1P 3/38)