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2009-10-20 |
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Operating apparatus for switching device |
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2002-04-16 |
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2002-02-12 |
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Contact material |
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2001-04-03 |
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Vacuum valve |
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2000-08-22 |
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Electrode arrangement of vacuum circuit breaker with magnetic member for longitudinal magnetization |
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2000-06-27 |
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Method of manufacturing a semiconductor device |
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1991-10-15 |
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Air-tight ceramic container |
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1990-04-17 |
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Method for processing vacuum switch and vacuum switch processed by the method |
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1988-04-05 |