Davis magneto-electric machine from later 19th century, hand-cranked, English or American make, 1854-1890 Magneto-electric machine 1854-1890
Late 19th century magneto-electric therapy apparatus, hand-cranked Late 19th century magneto-electric therapy apparatus
Late 19th century upright Davis magneto-electric therapy apparatus, hand-cranked Late 19th century upright Davis magneto-electric therapy apparatus
Later 19th century magneto-electric machine for electrotherapy, hand-cranked, probably infringing Davis' USA patent of 1854 Later 19th century magneto-electric machine for electrotherapy
