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Pipe repair coupling
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Patent number 4,386,796
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Issue date Jun 7, 1983
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R. W. Lyall Co., Inc.
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Robert W. Lyall
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Slip fit type tubing coupling
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Patent number 4,243,254
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Issue date Jan 6, 1981
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R. W. Lyall & Co., Inc.
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Donald C. Hill
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Ground level meter riser
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Patent number 4,094,537
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Issue date Jun 13, 1978
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Robert W. Lyall
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...