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Terms for subject Communications containing semaphore signal | all forms | in specified order only
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double-wire operated semaphore signal双线臂板信号机
electric semaphore signal电动臂板信号机
mechanically operated semaphore signal机械臂板信号机
power operated semaphore signal电动臂板信号机
single-wire operated semaphore signal单线臂板信号机

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