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Extrusion-forming device
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Patent number 9,174,357
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Issue date Nov 3, 2015
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NGK Insulators, Ltd.
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Yasunori Yamazaki
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B28 - WORKING CEMENT, CLAY, OR STONE
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Extrusion machine
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Patent number 4,548,565
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Issue date Oct 22, 1985
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DY-Core Systems Ireland Limited
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Christopher B. Bunn
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B28 - WORKING CEMENT, CLAY, OR STONE