| 摘要 |
An electric toothbrush consisting of an elongated body member having a cylindrical brush mounted coaxially therewith at one end thereof, and driven rotatably by a reversible electric motor carried in the handle, and having an automatic reversing switch responsive to the position in which the handle is held to cause rotation of the brush such that its bristles move in a direction from the gum line toward the crowns of the teeth.
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