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3816723
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Patent number 3,816,723
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Issue date Jun 11, 1974
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G05 - CONTROLLING REGULATING
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3699317
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Patent number 3,699,317
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Issue date Oct 17, 1972
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G05 - CONTROLLING REGULATING
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3699555
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Patent number 3,699,555
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Issue date Oct 17, 1972
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G05 - CONTROLLING REGULATING
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3634662
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Patent number 3,634,662
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Issue date Jan 11, 1972
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G05 - CONTROLLING REGULATING