| http://www.w3.org/ns/prov#value | - The air gap 52 is variable in size in that the upward angle of the track defined by cam rods 162 results in the vertical size of the air gap 52 increasing as the housing 159 moves forwardly along the track, i.e. in the direction of the second ends of the cam rods, and decreasing as the housing 159 moves rearwardly along the track, i.e. in the direction of the first ends of the cam rods.
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