Magneto-electric therapy machine, hand-cranked, English, after Davis 1854 Magneto-electric therapy machine after 1854
Magneto-electric therapy apparatus, hand-cranked, Davis-type, by Gray of Sheffield Magneto-electric therapy apparatus 1878-1900
Magneto-electric therapy apparatus, hand-cranked, probably infringeing Davis's USA patent of 1854 Magneto-electric therapy apparatus 1860-1900