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3504362
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Patent number 3,504,362
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Issue date Mar 31, 1970
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G05 - CONTROLLING REGULATING
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3483362
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Patent number 3,483,362
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Issue date Dec 9, 1969
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G05 - CONTROLLING REGULATING
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Patent number 3,458,787
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G05 - CONTROLLING REGULATING
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Patent number 2,885,613
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Issue date May 5, 1959
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G05 - CONTROLLING REGULATING