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Optical switching gate
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Patent number 6,005,994
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Issue date Dec 21, 1999
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Robert I. MacDonald
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Hermetic optical attenuator
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Patent number 4,695,125
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Issue date Sep 22, 1987
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Northern Telecom Limited
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William J. Sinclair
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B22 - CASTING POWDER METALLURGY
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Optical switch
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Patent number 4,378,144
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Issue date Mar 29, 1983
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Northern Telecom Limited
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Gary S. Duck
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G02 - OPTICS
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Electro-optic devices
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Patent number 4,284,884
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Issue date Aug 18, 1981
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Northern Telecom Limited
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John C. Dyment
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H01 - BASIC ELECTRIC ELEMENTS
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