| http://www.w3.org/ns/prov#value | - the end caps including a lower end cap over the bottom of the cylinder with a lower aperture in the lower end cap for the escape of air as the piston moves toward the bottom of the cylinder, the end caps including an upper end cap over the top of the cylinder with upper apertures in the upper end cap for the escape of air as the piston moves toward the top of the cylinder, the upper end cap having
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