| http://www.w3.org/ns/prov#value | - ng the plurality of half cells at predetermined spacings from each other and wheel means separate from the half cells for shifting the device and half cells from place to place along the surface by a distance (xA) where x is a whole number and A corresponds to the spacing between adjacent half cells, said frame comprising a bar having a slideway, a clamp for each half cell received in the slideway
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