Telephone key expansion unit

Assignee

• Siemens Rolm Communications

Inventors

• Stefan Hillenmayer (93 patents)
• Ulrich Skrypalle (6 patents)
• Wayne E. McKinnon (31 patents)
• David E. Bryant (25 patents)
• Mary E. Kingsbury (11 patents)
• Erich C. Elkins (16 patents)
• Doug A. Erwin (9 patents)

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