| 摘要 |
<p>An automatic cleaning device for phonograph records comprising an elongate arm having a downwardly depending brush at one end and a counterweight at the other end; said arm being mounted on a vertical elongate elastic member at a point nearer said counterweight than said brush; said arm being frictionally engaged by said vertical elastic member, to permit free rotation of said arm in a horizontal arc, and free pivoting of said arm in a vertical direction.</p> |
