| http://www.w3.org/ns/prov#value | - ped diaphragm being of such thickness that the space between the cylinder and piston head portion will be filled by diaphragm material from the forwardmost point of the' piston face rearwardly when the piston is in inoperative position, and means for securing the rear end of the cup-shaped member to the cylinder including a member having a cylindrical portion providing guide means for the piston.
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