Specification of Otto Gjerdrum
Subtitle: smoke-preventing apparatus
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Smoke prevention; Boilers; Furnaces
Notes: Cover title.

At head of title: A.D. 1870, 31st August. No. 2379.

"Otto Gjerdrum, of Christiania, in the kingdom of Norway, but at present of 89, Chancery Lane, London".