Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 279
Fig. I. G. B. SKYLIGHTLIFT AND LOCK … Fig. z. G. B. AUTO.MATICSELF-LOCKING SCUTTLE-OPENER SKYLIGHTS, ETC. 209 NATIONAL VENTILATING COMPANY NATIONAL VENTILATING COMPANY MANUFACTURERS OF National System of Ventilating Devices and National System Steel Puttyless Skylights Boston, Mass., Sii Paddock BuildingBaltimore, Md., 349 Equitable…
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