| http://www.w3.org/ns/prov#value | - In other embodiments, other types of sensors can be used to detect a particular position of the knob in the linear degree of freedom along axis Z, or to sense continuous linear motion along axis Z. For example, an optical sensor can use a detector strip parallel to the travel of the knob to detect a particular position of a point or area on the knob (or the gear or shaft 274) that emits or reflect
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