| http://www.w3.org/ns/prov#value | - According to the present invention, the above and other objects can be accomplished by a rotary piston engine including a casing comprised of a rotor housing having a trochoidal inner wall and a pair of side housings secured to the opposite sides of the rotor housing to define a rotor cavity therein, a substantially polygonal rotor disposed in said rotor cavity for rotation with apex portions in s
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