| http://www.w3.org/ns/prov#value | - The smaller cup 1 is formed, preferably at its apex, with an opening 4 in which an end 5 of a shaft 6 is secured; the other, screwthreaded end 7 of the shaft 6 is secured to a driving member, for example an electric motor, not shown, which imparts the required rotation movement to the device.
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