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| - In Fig. 1, A A represent two levers, pivoted together by a pin, a, the long arms of these levers being bent outward for the reception of a reel or drum, B, and the upper por tion of each lever having formed therein an opening, of square or other polygonal form, for the reception of the stem b of a nut, D, these nuts being adapted to the threaded portions of a rod, F, which passes through the reel
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