| http://www.w3.org/ns/prov#value | - Such means for shifting may take a wide variety of forms, including a wide variety of different types of motors, linear actuators, cylinders, cams, gears, or the like, but in the embodiment illustrated in FIG. 9 comprises a stepper motor 100 (controlled by the controller 50) which linearly reciprocates a shaft 101 in the dimension 73', the shaft 101 connected to a cross piece 102 which engages the
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