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Conduit making apparatus
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Patent number 4,183,724
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Issue date Jan 15, 1980
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David Larive
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B28 - WORKING CEMENT, CLAY, OR STONE
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3575353
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Patent number 3,575,353
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Issue date Apr 20, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3138335
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Patent number 3,138,335
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Issue date Jun 23, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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2966715
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Patent number 2,966,715
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Issue date Jan 3, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2809866
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Patent number 2,809,866
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Issue date Oct 15, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2795406
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Patent number 2,795,406
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Issue date Jun 11, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2701905
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Patent number 2,701,905
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Issue date Feb 15, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2696353
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Patent number 2,696,353
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Issue date Dec 7, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2596490
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Patent number 2,596,490
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Issue date May 13, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2398016
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Patent number 2,398,016
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Issue date Apr 9, 1946
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B28 - WORKING CEMENT, CLAY, OR STONE
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2368742
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Patent number 2,368,742
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Issue date Feb 6, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2301760
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Patent number 2,301,760
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Issue date Nov 10, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2283921
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Patent number 2,283,921
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Issue date May 26, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2177643
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Patent number 2,177,643
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Issue date Oct 31, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2004703
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Patent number 2,004,703
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Issue date Jun 11, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1625123
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Patent number 1,625,123
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Issue date Apr 19, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1623539
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Patent number 1,623,539
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Issue date Apr 5, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE