Specification of Gabriel Prax
Subtitle: apparatus for separating the liquid from the solid portions of fecal matters
Publisher: Great Seal Patent Office
Published: 1859
Place of publication: London
Language: eng
Subjects: Sewage; Sewerage; Filters and filtration
Notes: Cover title.

At head of title: A.D. 1858, 17th September. No. 2100.

"Gabriel Prax, of Paris (France), manufacturer".