| http://www.w3.org/ns/prov#value | - The use ofthe device will be readily under stood from the drawings, but may be briefly described as follows: It will be understood that it can be supported over head, or on a wall or other support at any desired height. `The hand pieces 7 are taken, one in each hand and alternately pulled andmetracted, turning the rotatable element 1, first in one direction and then in the other, said element taki
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