| http://www.w3.org/ns/prov#value | - the reel, said linkage including a piston, an air valve connected with the cylinder to transmit air thereto when the valve is open and to release air therefrom when the valve is closed, a valve-operating stem in the air valve setting the valve to open or closed positions alternatively, means movable with the linkage and-operable upon substantially 'com-- a plete withdrawal of the line from the re
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