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Power supply system
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Patent number 4,272,650
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Issue date Jun 9, 1981
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International Mobile Machines Incorporated
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Duane R. Bolgiano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Monostable system
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Patent number 4,263,556
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Issue date Apr 21, 1981
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International Mobile Machines Incorporated
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Duane R. Bolgiano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Tone detector
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Patent number 4,211,938
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Issue date Jul 8, 1980
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International Mobile Machines Incorporated
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Duane R. Bolgiano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Portable telephone system
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Patent number 4,130,731
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Issue date Dec 19, 1978
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International Mobile Machines Incorporated
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Duane R. Bolgiano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE