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Grooved connector
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Patent number 4,657,287
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Issue date Apr 14, 1987
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The Brooklyn Union Gas Company
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Helmut E. Nimke
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Connector for tubular members
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Patent number 4,549,752
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Issue date Oct 29, 1985
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UMAC, Inc.
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Helmut E. Nimke
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Connecting or repair device
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Patent number 4,465,309
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Issue date Aug 14, 1984
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UMAC, Inc.
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Helmut E. Nimke
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...