David C. Harms

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Circuit arrangement for use in telephone systems

Patent

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Personal computer assisted multiple line access

Telephonic communications – Polystation line system
Reexamination Certificate

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Two stage transformer coupling for ultra-sensitive silicon...

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate

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Two stage transformer coupling for ultra-sensitive silicon...

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate

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Profile ID: LFUS-PAI-P-527704

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