Specification of Julius Jeffreys
Subtitle: respirators
Publisher: Great Seal Patent Office
Published: 1857
Place of publication: London
Language: eng
Subjects: Respirators (Medical equipment)
Description: Patent for improvements to his previous design for a respirator.
Notes: Cover title.

At head of title: A.D. 1850. No. 12,984.

"Julius Jeffreys, of Bucklersbury, in the city of Surrey, gentleman".