Late 19th century Davis magneto-electric therapy apparatus, hand-cranked, by Burnap of Lowell, Massachusetts Late 19th century Davis magneto-electric therapy apparatus 1854-1890
Magneto electrotherapy machine, Davis type, possibly made by Elliott of London, 1860-1920 Magneto electrotherapy machine 1860-1920
Late 19th century Davis magneto-electric therapy machine, hand-cranked, English Late 19th century Davis magneto-electric therapy machine 1878-1900
Davis magneto-electric therapy apparatus, hand-cranked, late 19th century Davis magneto-electric therapy apparatus 1871-1900