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Alarm Attachment for Electric Bells.
Patent for "an Alarm Attachment for Electric Bells." "The object in view is the provision of means for facilitating the change of an ordinary door-bell into a continuously-ringing alarm apparatus, while leaving the mechanism free to be changed back into its former operative condition as a door-bell."(Lines 10-15) Including illustrations and instructions.
Date:
June 30, 1902
Creator:
Blakeney, Henry
System:
The Portal to Texas History