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Breakaway utility pole
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Patent number 5,060,437
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Issue date Oct 29, 1991
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Shakespeare Company
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James H. Parsons
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Breakaway utility pole
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Patent number 4,920,715
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Issue date May 1, 1990
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Shakespeare Company
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James H. Parsons
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Tie rod support for mine
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Patent number 4,140,428
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Issue date Feb 20, 1979
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Shakespeare Company
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Philippe H. McLain
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E21 - EARTH DRILLING MINING
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Ladder hook assembly and ladder
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Patent number 4,089,390
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Issue date May 16, 1978
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Shakespeare Company
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Philippe Hardy-The McLain
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS