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Rudder error detector
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Patent number 4,055,135
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Issue date Oct 25, 1977
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Sperry Rand Corporation
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Charles R. Wesner
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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3082423
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Patent number 3,082,423
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Issue date Mar 19, 1963
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G08 - SIGNALLING
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2668285
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Patent number 2,668,285
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Issue date Feb 2, 1954
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G08 - SIGNALLING
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2575357
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Patent number 2,575,357
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Issue date Nov 20, 1951
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G08 - SIGNALLING
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2241475
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Patent number 2,241,475
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Issue date May 13, 1941
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G08 - SIGNALLING