| http://www.w3.org/ns/prov#value | - Apparatus as claimed in anyone of claims 27 to 30 wherein the pectrophotometer includes an exchangeable accessory, the apparatus including a manually operable mechanism for attaching the exchangeable accessory to the instrument, the mechanism including a manually rotatable camming means associated with one of the accessory or the instrument, a male member associated with the other of the accessory
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