X-Ray exposure timer. Timing 1/20 seconds to 10 seconds. X-Ray exposure timer. Timing 1/20 seconds to 10 seconds
Timer, for use during electrotherapeutic treatment, by A. Gaiffe, Paris, 1890-1910, owned by Dr. A. Bruce, Edinburgh, 1890-1910 Timer, for use during electrotherapeutic treatment 1890-1910