| http://www.w3.org/ns/prov#value | - As shown in FIG. 6, when the reflective member 23 of the reference wheel 20 is aligned with the light emitting device 41 of the detecting device 40, the reflective member 23 may reflect the light, such that the light receiving device 43 of the detecting device 40 will receive a signal, such as a pulse or an ???on??? signal, as shown in step 2 of the receiving part ???R???.
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