| http://www.w3.org/ns/prov#value | - Referring to FIGS. 1, 2 and particularly 3A and 3B, the air track assembly of system 10, has located, at appropriate points along the track, a sequence of light activated sensors 37, which are adjustably located on opposing sides of the air track assembly to sense the presence of each part as it reaches a predetermined position and command the stopping arm to stop and hold or release or pass the p
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