Great Britain. Patent Office. Patents for inventions : Abridgments of specifications relating to electricity and magnetism, their generation and applications.

Great Britain. Patent Office.

Patents for inventions : Abridgments of specifications relating to electricity and magnetism, their generation and applications.

Electric apparatus and appliances -- Patents.

Patents -- Great Britain.

Magnetic instruments -- Patents.

Jehl, Francis, 1863-1941,

Dibner, Bern. DSI.

Abridgments of specifications relating to electricity and magnetism.

England London.