| http://www.w3.org/ns/prov#value | - and with the screw-threaded portion 3 of the casing; a circularly shaped diaphragm 5 made of rubber or other suitable resilient, stretchable and durable composition received by and seated within the fitting 4; a transparent and wear resistant tubular shield or sleeve 6 of crosssectional shape and size which will permit its snug reception within the casing 1; a cylindrical cup-like indicator 7 pref
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