Specification of Bertram Mitford
Subtitle: communicating with deaf and dumb persons
Publisher: Great Seal Patent Office
Published: 1868
Place of publication: London
Language: eng
Subjects: Mutism; Persons With Hearing Impairments; Communication devices for people with disabilities
Notes: Cover title.

At head of title: A.D. 1868, 30th March. No. 1075.

"Bertram Mitford, of Cheltenham, in the county of Gloucester".