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Portable traffic control device
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Patent number 7,025,526
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Issue date Apr 11, 2006
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PMG, Inc.
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William H. Blair
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Portable speed bump
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Patent number 6,623,206
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Issue date Sep 23, 2003
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PMG, Inc.
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William H. Blair
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G08 - SIGNALLING
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Spike belt
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Patent number 6,551,013
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Issue date Apr 22, 2003
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PMG, Inc.
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William L. Blair
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Tire deflating blade system
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Patent number 6,409,418
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Issue date Jun 25, 2002
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PMG, Inc.
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William H. Blair
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES