| http://www.w3.org/ns/prov#value | - Optionally, the sensing device 22 may include a locating device or location determining device 30, such as a locating device similar to locating device 13 described above or such as a rotary encoder or the like (such as, for example, a rotary encoder that may determine the rotation and travel of a wheel, such as a wheel that engages a conveyor beam or the like, along which the trolleys are moved a
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