| http://www.w3.org/ns/prov#value | - portion for clamping said carriage in any desired position along said length of said frame, said first clamping portion including a clamping member insertable into said groove; said frame including an upper surface and a lower surface, said groove located between said upper and lower surface; said frame including first and second clamping flanges, each of said clamping flanges oriented substantia
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