There are manual type, pneumatic type and hydraulic type WS spoolers for choice.

WS收线机分别有手动式、气动式、液压式的机型供用户选择。

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All the patients were treated with canalplasty, and 84 cases(84 ears) with mastoid process of pneumatic type were treated with tympanoplasty and canalplasty.

对84例（84耳）气化型乳突患者同时行耳道成形术和鼓室成形术。

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Arm pneumatic type driving, simple construction, trouble free.

臂气压式驱动构造简单、故障机率少。

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Arm pneumatic type driving, simple construction, trouble free.

臂气压式驱动构造简单、故障机率少。

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