Howard's patent ventilator
Subtitle: a scientific invention of cheap construction, applicable at small cost to all buildings, railroad cars, passenger vessels, etc.
Publisher: s.n.]
Published: 1986
Place of publication: [St. John's N.B.?
Language: eng
Format: Microform
Number of pages: 11
Subjects: Ventilation.
Notes: Cover title.

Filmed from a copy of the original publication held by the Douglas Library, Queen's University. Ottawa : Canadian Institute for Historical Microreproductions, 1986.

15 p. ; 22 cm.