| http://www.w3.org/ns/prov#value | - A fluid machine comprising:housing means having a generally cylindrical piston bore formed therein and a guide bore coaxial with said piston bore; said guide bore including a portion defined by an annular collar extending into said piston bore and coacting with said piston bore to define an annular space axially coextensive with said collar; piston means having an annular cylindrical portion recip
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