Specification of Joseph Judge Hays
Subtitle: purifying and utilizing sewage
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Sewage; Sewerage; Sewage disposal plants; Filters and filtration; Manures; Deodorization
Notes: Cover title.

At head of title: A.D. 1870, 20th August. No. 2297.

"Joseph Judge Hays, of Hertingforbury, in the county of Hertford, gentleman".