| http://www.w3.org/ns/prov#value | - A clamping light as defined in claim 11 wherein said holder means comprises a slideway extending laterally of said index wheel, and said light means includes a casing having a complementary rail portion adapted to be slidably received in said slideway; and said latching means including an opening formed in said top plate of said housing and said holder including a catch adapted to be received in s
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