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Electrically Operating Door

Description: Patent for electrically operating door.
Date: March 10, 1903
Creator: Chambers, Joseph, Jr.
Partner: UNT Libraries Government Documents Department

Electrical Alarm System

Description: Patent for an electrical alarm system based on a protected circuit that alarms at any tampering or interference.
Date: March 10, 1903
Creator: Sutton, Henry M.; Steele, Walter L. & Coerver, Michael
Partner: UNT Libraries Government Documents Department
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