mechanical timer
机械定时控制器 definite mechanical time controller
机械厨房定时器 MECHANICAL KITCHEN TIMER
机械定时继电器 mechanically-timed relay
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将420B型煮沸消毒器的机械定时器改为电子定时器，并加装显示电路，使其定时直观、工作稳定、便于维修。
Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular, operation stable and maintenance easy.
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