3 Matching Results

Search Results

Advanced search parameters have been applied.
in place name: "United States - Texas - Mason County - Mason"  
Results: 1 - 3

Telephone Signal

Description: Patent for a telephone signals. This inventions is a switchboard drop of the visual signal for magneto system at a central office. Illustration included.
Date: January 8, 1907
Creator: Schuessler, Gustavus W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
Back to Top of Screen