1. Mihan's tower ventilator: patented Sept. 4th, 1877, May 7th, 1878 Publication: Boston : [publisher not identified], [1878?] Subject(s): Ventilation -- instrumentationMihan, P.
2. Office of the D.C. Green Ventilating Company Publication: [New York : s.n., 188-] Subject(s): VentilationVentilation -- instrumentation
