Specification of William Spence
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1875
Place of publication: London
Language: eng
Subjects: Sewerage; Urine; Sewage; Filters and filtration; Phosphates
Notes: Cover title.

At head of title: A.D. 1874, 14th July. No. 2461.

"William Spence, of 8, Quality Court, Chancery Lane, in the county of Middlesex, patent agent".