-
2972045
-
Patent number 2,972,045
-
Issue date Feb 14, 1961
-
B61 - RAILWAYS
-
2637168
-
Patent number 2,637,168
-
Issue date May 5, 1953
-
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
-
2158931
-
Patent number 2,158,931
-
Issue date May 16, 1939
-
B61 - RAILWAYS
-
2076928
-
Patent number 2,076,928
-
Issue date Apr 13, 1937
-
B61 - RAILWAYS
-
1999823
-
Patent number 1,999,823
-
Issue date Apr 30, 1935
-
B61 - RAILWAYS
-
1879252
-
Patent number 1,879,252
-
Issue date Sep 27, 1932
-
B61 - RAILWAYS
-
1797974
-
Patent number 1,797,974
-
Issue date Mar 24, 1931
-
B61 - RAILWAYS
-
1650419
-
Patent number 1,650,419
-
Issue date Nov 22, 1927
-
B61 - RAILWAYS