| http://www.w3.org/ns/prov#value | - The tool 200 is similar to the tools described above, particularly the tool 10, and comprises structure defining a combustion chamber 210, structure defining a piston chamber 220 having an inner, cylindrical wall 222, a driving piston 230 movable axially within the piston chamber 220 over a stroke between an initial position, which is an upper position in the drawings, and a terminal position, whi
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