Specification of William Clark
Subtitle: ear stoppers
Publisher: Great Seal Patent Office
Published: 1867
Place of publication: London
Language: eng
Subjects: Rubber; Ear Protective Devices
Notes: At head of title: A.D. 1867, 3rd April. No. 995.

"William Clark, of 53, Chancery Lane, in the county of Middlesex, engineer and patent agent."