Specification of Thomas Harrison Granger and Jean Paul Louis Hyan
Subtitle: removing sewage gas
Contributors: Hyan, Jean Paul Louis
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Sewer gas; Sewage; Sewerage; Ventilation
Notes: Cover title.

At head of title: A.D. 1871, 31st May. No. 1445.

"Thomas Harrison Granger & Jean Paul Louis Hyan, of Berlin, in the kingdom of Prussia, manufacturers"