Electro-magnetic apparatus : (this invention received provisional protection only) : provisional specification left by Edward Griffith Brewer at the Office of the Commissioners of Patents on the 28th July 1877 ... of Chancery Lane, in the County of Middlesex : "Improvements in Electro-magnetic apparatus".
- Brewer, Edward Griffith
- Date:
- 1877
Licence: Public Domain Mark
Credit: Electro-magnetic apparatus : (this invention received provisional protection only) : provisional specification left by Edward Griffith Brewer at the Office of the Commissioners of Patents on the 28th July 1877 ... of Chancery Lane, in the County of Middlesex : "Improvements in Electro-magnetic apparatus". Source: Wellcome Collection.
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