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Manhole assembly
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Patent number 11,530,522
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Issue date Dec 20, 2022
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GENEVA PIPE AND PRECAST
COMPANY
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Jed Christopher Friesen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Manhole assembly
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Patent number 10,961,681
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Issue date Mar 30, 2021
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Predl Systems North America Inc
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Jed Christopher Friesen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Manhole lid to base connection
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Patent number 10,662,606
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Issue date May 26, 2020
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Predl Systems North America Inc
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Jed Christopher Friesen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Manhole assembly
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Patent number 10,563,373
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Issue date Feb 18, 2020
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Predl Systems North America Inc
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Jed Christopher Friesen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Sheet piling extrusion
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Patent number 6,000,883
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Issue date Dec 14, 1999
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John E. Irvine
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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