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3749995
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Patent number 3,749,995
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Issue date Jul 31, 1973
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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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3525917
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Patent number 3,525,917
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Issue date Aug 25, 1970
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G05 - CONTROLLING REGULATING
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3448253
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Patent number 3,448,253
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Issue date Jun 3, 1969
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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3416056
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Patent number 3,416,056
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Issue date Dec 10, 1968
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G05 - CONTROLLING REGULATING