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Service line interior by-pass fitting
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Patent number 4,434,816
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Issue date Mar 6, 1984
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Bernard A. Di Giovanni
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Service line interior by-pass kit
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Patent number 4,427,112
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Issue date Jan 24, 1984
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Bernard A. Di Giovanni
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Service line interior by-pass
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Patent number 4,427,032
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Issue date Jan 24, 1984
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Bernard A. Di Giovanni
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Service line interior by-pass
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Patent number 4,377,945
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Issue date Mar 29, 1983
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Bernard A. Di Giovanni
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...