| 摘要 |
A revolution sensor device for a spool on a reel for the purpose of causing the spool to rotate at a uniform rate for obviating vibrations and audible resonance, as well as being productive of longevity of operation of the spool; said sensor comprising a magnet mounted on the spool for rotation therewith, magnetic coacting devices fixed on the spool, and with suitable counter-weighting of the magnet upon the spool.
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