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Block-ramming machine
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Patent number 7,311,865
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Issue date Dec 25, 2007
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Larry Don Williamson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Cold isopressing method
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Patent number 6,372,165
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Issue date Apr 16, 2002
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Praxair Technology, Inc.
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Prasad S. Apte
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B28 - WORKING CEMENT, CLAY, OR STONE
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3781156
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Patent number 3,781,156
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Issue date Dec 25, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3484514
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Patent number 3,484,514
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Issue date Dec 16, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3315304
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Patent number 3,315,304
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Issue date Apr 25, 1967
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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3270113
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Patent number 3,270,113
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Issue date Aug 30, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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1792844
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Patent number 1,792,844
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Issue date Feb 17, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1374173
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Patent number 1,374,173
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Issue date Apr 12, 1921
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...