Specification of John Imray
Subtitle: respiratory apparatus
Publisher: Great Seal Patent Office
Published: 1873
Place of publication: London
Language: eng
Subjects: Breathing apparatus; Air-pump; Air-pumps
Description: Patent for "apparatus for suporting respiration and light in suffocating atmospheres and under water".
Notes: At head of title: A.D. 1873, 22nd May. No. 1852.

"John Imray, of no.20, Southampton Buildings, Chancery Lane, in the county of Middlesex".