-
3058190
-
Patent number 3,058,190
-
Issue date Oct 16, 1962
-
B28 - WORKING CEMENT, CLAY, OR STONE
-
2917801
-
Patent number 2,917,801
-
Issue date Dec 22, 1959
-
B28 - WORKING CEMENT, CLAY, OR STONE
-
2781554
-
Patent number 2,781,554
-
Issue date Feb 19, 1957
-
B28 - WORKING CEMENT, CLAY, OR STONE