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Telephone message timing system
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Patent number 4,058,680
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Issue date Nov 15, 1977
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Bell Telephone Laboratories, Incorporated
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Robert Bartlett Curtis
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3562436
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Patent number 3,562,436
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Issue date Feb 9, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3483328
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Patent number 3,483,328
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Issue date Dec 9, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3444519
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Patent number 3,444,519
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Issue date May 13, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3342939
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Patent number 3,342,939
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Issue date Sep 19, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3342940
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Patent number 3,342,940
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Issue date Sep 19, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3208047
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Patent number 3,208,047
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Issue date Sep 21, 1965
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G06 - COMPUTING CALCULATING COUNTING
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3187312
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Patent number 3,187,312
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Issue date Jun 1, 1965
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G06 - COMPUTING CALCULATING COUNTING
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3156772
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Patent number 3,156,772
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Issue date Nov 10, 1964
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H04 - ELECTRIC COMMUNICATION TECHNIQUE