| http://www.w3.org/ns/prov#value | - With reference particularly to FIG. 1, it should be apparent that when one of the swing arms 16 is lowered to its maintenance position, the associated circuit board 8 is exposed for inspection or it may be removed from the frame 1 for repair or replacement by pulling it rearward and freeing it from the guide rails 6 and 7.
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