| http://www.w3.org/ns/prov#value | - More particularly, the circumferential width of each of the projections 21 and that of each of the gaps 21a are set equal to each other and, when this is W, the positions of the photo-couplers 22a, 22b are circumferencewise spaced apart from each other by a distance of (n+1/4)???2W, where n is an integer, the unity in this embodiment.
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