Tri-lok open steel flooring, concrete armoring, safety steps, T-Tri-lok : manufactured by the Tri-lok Company, Pittsburgh, Pa. :

Name: Tri-lok open steel flooring, concrete armoring, safety steps, T-Tri-lok : manufactured by the Tri-lok Company, Pittsburgh, Pa. :
Author: Tri-lok Company

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Description

Tri-lok open steel flooring, concrete armoring, safety steps, T-Tri-lok : manufactured by the Tri-lok Company, Pittsburgh, Pa. : Dravo-Doyle Company, Pittsburgh, national distributors.

Author: Tri-lok Company

Year: 1920

Includes dimensions, specifications and index; illustrates installations of Tri-lok products