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Home › Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link

Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link

US Patent 6711238 · Granted Mar 23, 2004

Estimated economic value: $888,000 ⓘ

Assignee

Zoom Telephonics

Inventors

Frank B. Manning (14 patents)
William Hume Vance (5 patents)

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