Specification of David Gill
Subtitle: deodorizing sewer gas
Publisher: Great Seal Patent Office
Published: 1875
Place of publication: London
Language: eng
Subjects: Sewer gas; Deodorization; Sewage; Sewerage; Chlorine
Notes: Cover title.

At head of title: A.D. 1875, 23rd July. No. 2621.

"David Gill, of the town of Weston-super-Mare, in the county of Somerset".