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Home › Telephone with unified features for hearing and deaf users

Telephone with unified features for hearing and deaf users

US Patent 5604786 · Granted Feb 18, 1997

Assignee

Ultratec

Inventors

Robert M. Engelke (98 patents)
Kevin R. Colwell (89 patents)
Ronald W. Schultz (9 patents)
Troy Vitek (55 patents)

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