| http://www.w3.org/ns/prov#value | - Description of the Background ArtOne example of a device that detects a rotational state of a rotary member, in particular such characteristics as rotation speed and amount of rotation thereof (i.e., angle of rotation), is a photoelectric rotary encoder. as rotation speed and amount of rotation thereof (i.e., angle of rotation), is a photoelectric rotary encoder.In the photoelectric rotary encoder
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