Specification of William Hopkinson and John Dewhurst
Subtitle: consuming smoke
Contributors: Dewhurst, John
Publisher: Great Seal Patent Office
Published: 1858
Place of publication: London
Language: eng
Subjects: Smoke prevention; Furnaces
Notes: Cover title.

At head of title: A.D. 1858, 1st May. No. 979.

"William Howarth and Ambrose Howarth, both of Bradford, in the county of York, dentists".