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3679813
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Patent number 3,679,813
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Issue date Jul 25, 1972
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3612752
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Patent number 3,612,752
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Issue date Oct 12, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3580989
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Patent number 3,580,989
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Issue date May 25, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3531586
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Patent number 3,531,586
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Issue date Sep 29, 1970
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G07 - CHECKING-DEVICES
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3478162
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Patent number 3,478,162
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Issue date Nov 11, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3476872
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Patent number 3,476,872
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Issue date Nov 4, 1969
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G11 - INFORMATION STORAGE
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3435130
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Patent number 3,435,130
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Issue date Mar 25, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3383462
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Patent number 3,383,462
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Issue date May 14, 1968
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G11 - INFORMATION STORAGE
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3379825
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Patent number 3,379,825
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Issue date Apr 23, 1968
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3365542
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Patent number 3,365,542
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Issue date Jan 23, 1968
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G11 - INFORMATION STORAGE
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3355546
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Patent number 3,355,546
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Issue date Nov 28, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3350502
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Patent number 3,350,502
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Issue date Oct 31, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3347982
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Patent number 3,347,982
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Issue date Oct 17, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3336439
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Patent number 3,336,439
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Issue date Aug 15, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE