Electro-magnetic apparatus
Subtitle: (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"
Publisher: [Great Seal Patent Office?]
Published: 1877
Place of publication: [London?]
Language: eng
Subjects: Electromagnets; Rings; Eyeglasses; Hats; Magnetic Field Therapy; Electric Stimulation Therapy
Notes: Title from head of text.

At head of title: A.D. 1877, 28th July. No. 2889.