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Create the page "Annunciator, fire alarm, room call.JPG" on this wiki! See also the page found with your search.

• Hotel Annunciator
  [[Image:annunciator.JPG|thumb|right|Hotel Annunciator; calls have been placed from rooms 9, 29, and 50]] ...” The earliest officially documented form discovered is for J. Russel's "Annunciator," patented October 10, 1829 by the U.S. Patent office. The device pictured
  19 KB (3,144 words) - 10:34, 24 November 2010