| 摘要 |
A helical spring for producing artificial reverberation, with the frequencies to be reverberated being impressed thereon in the form of torsional vibrations, has individual turns, at random locations therealong, deformed irregularly from a normally circular configuration. Portions of the deformed turns may be deformed outwardly from the normally circular configuration or deformed inwardly therefrom, or in both directions, but in the plane of the circular configuration.
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