| http://www.w3.org/ns/prov#value | - The head 16 contains an explosive primer or percussion cap 22 operatively connected to the deflagatory charge 23 whose composition, quantity, form and other characteristics are carefully chosen so that on detonation the gaseous products introduced into chamber 21 impart to piston 18 the precise impulse necessary to eject the medicament 17 through orifice 15 under sufficient pressure to insure its
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