Specification of Arnold Hirst Watkins
Subtitle: respirators
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Respiratory Protective Devices
Description: Patent for "an improved respirator to be used in confined positions rendered unhealthy from the presence of noxious gases or effluvia"
Notes: Cover title.

At head of title: A.D. 1870, 2nd November. No. 3056.

"Arnold Hirst Watkins, of Nailsworth, in the county of Gloucester,brewer".