| http://www.w3.org/ns/prov#value | - means being adjustable from above said support surface; said clamping means including first and second clamping surfaces, said first clamping surface contacting the upper side of said support surface and said second clamping surface contacting the lower side of said support surface, means connected to said second clamping surface for pivoting said second clamping surface into and out of a positio
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