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Home › Method and apparatus for ensuring accessibility to emergency service via VoIP or via PSTN

Method and apparatus for ensuring accessibility to emergency service via VoIP or via PSTN

US Patent 8750290 · Granted Jun 10, 2014

Estimated economic value: $400,000 ⓘ

Assignee

Zoom Telephonics

Inventors

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

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