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Method of control of water-tightness of watch
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Method of testing of water-tightness of watches
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Method of testing watch for tightness
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Method of testing watches for leaks
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Method of testing of water-tightness of watches
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Method of testing watches for tightness
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Method of testing of water-tightness of watches
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Method for checking watches for waterproofness
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Quartz watch
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Quartz-crystal watch with audible signal
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Transistor half-bridge inverter control device
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