-
-
1740324
-
Patent number 1,740,324
-
Issue date Dec 17, 1929
-
B28 - WORKING CEMENT, CLAY, OR STONE
-
1729602
-
Patent number 1,729,602
-
Issue date Oct 1, 1929
-
B28 - WORKING CEMENT, CLAY, OR STONE
-
1632938
-
Patent number 1,632,938
-
Issue date Jun 21, 1927
-
B28 - WORKING CEMENT, CLAY, OR STONE