Tri-lok open steel flooring, concrete armoring, safety steps, T-Tri-lok
Subtitle: manufactured by the Tri-lok Company, Pittsburgh, Pa. : Dravo-Doyle Company, Pittsburgh, national distributors
Contributors: Dravo-Doyle Company
Series: Catalog -- 1029; Catalog -- 1029.
Publisher: Tri-lok Company?
Published: 1920
Place of publication: Pittsburgh, Pa.?
Language: eng
Number of pages: 20
Subjects: Flooring; Catalogs; Grilles; Steel
Other titles: Open steel flooring.
Notes: Includes dimensions, specifications and index; illustrates installations of Tri-lok products.

"A.I.A. File No. 14-P-21."--Cover.