1901 Edison Portland Cement Co Stock Certificate. Nifty Edison scripophily document with vignette of Thomas Edison. Edisons interest in concrete started with his attempts to to improve iron ore milling processes. His ore-milling company produced fine sand as a byproduct, which is useful in the manufacture of cement. The Edison Portland Cement company provided the cement to build Yankee stadium in 1922. The company failed in the 1930s depression. VF+ condition.