Chicago : Engineering and Contracting Pub. Co. · leaf 339
timbers, and also upon the intermediateearth or composition foundation. The sectionsare formed so as to properly interlock with eachother and present a suitable street surface.No. 71,746. Improved Street Pavement; Alex-ander Hamar, New York, N. Y., inventor;patented Dec. 3, 1867.In this invention…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
