Specification of Frederick Ludewig Hahn Danchell
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Sewage; Sewerage; Filters and filtration; Sewage disposal plants
Notes: Cover title.

At head of title: A.D. 1870, 14th December. No. 3269.

"Frederick Ludewig Hahn Danchell, of Horwich, in the county of Lancaster, engineer".