Specification of William Clark
Subtitle: producing draught and purifying smoke in furnaces
Publisher: Great Seal Patent Office
Published: 1867
Place of publication: London
Language: eng
Subjects: Smoke prevention; Furnaces
Notes: At head of title: A.D. 1866, 21st December. No. 3371.

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