| http://www.w3.org/ns/prov#value | - Prior to threadedly telescoping the integral stem 19 of the piston 9 into the threaded bore of the inner end-portion 17 of the stainless-steel piston-rod 13, the externally threaded portion of the stem 19 (formed of Teon, Kel-F or the like) is treated for a minute or so with a composition of anhydrous ammonia and an alkali metal such as sodium, namely, until a Very slight adherent carbon layer is
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