| 摘要 |
An electric rotary toothbrush having an integral stem and brush guard housing within which is an axially moveable brush drive shaft and a removable brush. The brush drive shaft is manually controlled for axial movement by a control knob located on the stem and brush guard housing to lock the brush so that it is rotatably mounted on both sides thereof within the stem and brush guard housing and to allow removal of the brush from the housing.
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