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Pile extruder
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Patent number 3,989,431
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Issue date Nov 2, 1976
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Spirill Corporation Ltd.
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Ernst Martens
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B28 - WORKING CEMENT, CLAY, OR STONE
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3926541
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Patent number 3,926,541
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Issue date Dec 16, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3892826
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Patent number 3,892,826
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Issue date Jul 1, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3647308
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Patent number 3,647,308
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Issue date Mar 7, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3605217
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Patent number 3,605,217
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Issue date Sep 20, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3529330
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Patent number 3,529,330
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Issue date Sep 22, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3217375
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Patent number 3,217,375
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Issue date Nov 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3143781
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Patent number 3,143,781
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Issue date Aug 11, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE