-
3485498
-
Patent number 3,485,498
-
Issue date Dec 23, 1969
-
G11 - INFORMATION STORAGE
-
3445117
-
Patent number 3,445,117
-
Issue date May 20, 1969
-
G11 - INFORMATION STORAGE
-
2957367
-
Patent number 2,957,367
-
Issue date Oct 25, 1960
-
G11 - INFORMATION STORAGE
-
2775131
-
Patent number 2,775,131
-
Issue date Dec 25, 1956
-
G11 - INFORMATION STORAGE