| http://www.w3.org/ns/prov#value | - In the embodiment of FIGS. 1-3 a straight hollow tube or needle, such as a hypodermic needle, may be connected to the piston 36 and urged thereby when the piston is longitudinally moved through the head to penetrate the interface 44 and become projected from the end of the head 32 so as to penetrate tissue or bone immediately adjacent the end of the head and/or expell a fluid through such needle w
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