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3204189
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Patent number 3,204,189
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Issue date Aug 31, 1965
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G08 - SIGNALLING
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2997607
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Patent number 2,997,607
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G08 - SIGNALLING
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2216069
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Patent number 2,216,069
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Issue date Sep 24, 1940
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G08 - SIGNALLING
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2085415
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Patent number 2,085,415
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Issue date Jun 29, 1937
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G08 - SIGNALLING