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Multi-cage spacer
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Patent number 8,322,109
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Issue date Dec 4, 2012
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Royal Environmental Systems, Inc.
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Julian P. Trangsrud
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E04 - BUILDING
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Liquid filtration system
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Patent number 7,632,403
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Issue date Dec 15, 2009
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Royal Environmental Systems, Inc.
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Carsten Dierkes
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Mechanical warning device
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Patent number 7,044,077
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Issue date May 16, 2006
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Royal Environmental Systems, Inc.
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Bradley C. Currie
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G01 - MEASURING TESTING
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Outside drop for manhole
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Patent number 6,695,002
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Issue date Feb 24, 2004
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Royal Environmental Systems, Inc.
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Julian P. Trangsrud
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Extension for a canal bed liner
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Patent number 6,206,609
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Issue date Mar 27, 2001
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Royal Environmental Systems, Inc.
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Julian P. Trangsrud
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Stabilizing ground anchor
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Patent number D420891
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Issue date Feb 22, 2000
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Royal Environmental Systems, Inc.
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Julian P. Trangsrud
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D08 - Tools and hardware
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MULTI-CAGE SPACER
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Publication number 20100300033
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Publication date Dec 2, 2010
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Royal Environmental Systems, Inc.
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Julian P. Trangsrud
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E04 - BUILDING
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Liquid Filtration System
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Publication number 20100025313
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Publication date Feb 4, 2010
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Royal Environmental Systems, Inc.
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Carsten Dierkes
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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LIQUID FILTRATION SYSTEM
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Publication number 20080121579
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Publication date May 29, 2008
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Royal Environmental Systems, Inc.
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Carsten Dierkes
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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