Appliances for generating an applying electricity : letters patent to Isac Louis Pulvermacher, of 194, Regent Street, in the county of Middlesex, England, electrical engineer, for the invention of "Improved apparatus or appliances connected with generating, conducting, measuring, or testing and applying electricity" : sealed the 23rd March 1877, and dated the 28th September 1876.

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Appliances for generating an applying electricity : letters patent to Isac Louis Pulvermacher, of 194, Regent Street, in the county of Middlesex, England, electrical engineer, for the invention of "Improved apparatus or appliances connected with generating, conducting, measuring, or testing and applying electricity" : sealed the 23rd March 1877, and dated the 28th September 1876. Public Domain Mark. Source: Wellcome Collection.