Specification of Burton Henry Vallé
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1875
Place of publication: London
Language: eng
Subjects: Sewage; Sewerage; Filters and filtration; Sewer gas
Notes: Cover title.

At head of title: A.D. 1874, 3rd November. No. 3784.

"Burton Henry Vallé, of Stow-on-the-Wold, in the county of Gloucester"