Late C19 mahogany-mounted shocking coil apparatus Late C19 mahogany-mounted shocking coil apparatus 1860-1910
Complete Grigg's electro-magnetic therapy machine, late 19th century by Chislett of Plymouth Complete Grigg's electro-magnetic therapy machine 1873-1886
Metronome current interruptor for electrotherapy by Schall of London, 71 and 75 New Cavendish Street, London, W1, England, 1905-1914. Metronome current interruptor for electrotherapy by Schall of London 1905-1914