| http://www.w3.org/ns/prov#value | - In a similar manner, the second end sensor device 208 has a pivotally mounted engagement member 218 which is configured to be physically contacted by the head 214 and which responds by moving in a clockwise direction towards the second end sensor device 208 and actuates a sensor, e.g. a switch or solenoid, depicted by element 218??? in FIG. 16.
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