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Friedrich Bertignoll
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Ottawa, CA
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last 30 patents
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Patent Grant
Electrostatic discharge protector for an electret microphone
Patent number
4,817,164
Issue date
Mar 28, 1989
Northern Telecom Limited
Friedrich Bertignoll
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Telephone handset cord guide and retainer
Patent number
4,598,176
Issue date
Jul 1, 1986
Northern Telecom Limited
Desmond J. Ryan
H04 - ELECTRIC COMMUNICATION TECHNIQUE