Portable magnetic appliances : letters patent to Thomas Welton, of 13 Grafton Street West, Fitzroy Square, London, in the county of Middlesex, maker of artifcial limbs, for the invention of "Improvements in portable magnetic appliances, in conjunction with medicinal substances for the cure of diseases " : Sealed the 1st July 1879, and dated the 28th April 1879.

Licence: Public Domain Mark

Credit: Portable magnetic appliances : letters patent to Thomas Welton, of 13 Grafton Street West, Fitzroy Square, London, in the county of Middlesex, maker of artifcial limbs, for the invention of "Improvements in portable magnetic appliances, in conjunction with medicinal substances for the cure of diseases " : Sealed the 1st July 1879, and dated the 28th April 1879. Source: Wellcome Collection.