How it started
Early years
The company was founded in 1901 by Charles Day and Kern Dodge, son of James Mapes Dodge, as Dodge & Day, specializing in engineering, shop equipment and management. Later, the scope of the organization was enlarged to include a great deal of engineering and construction work in both the industrial and public-service fields.
In 1907 another former classmate John Zimmermann joined the firm as partner, and they renamed the firm Dodge, Day & Zimmermann. After Kern Dodge withdrew as partner in 1911 the firm became Day & Zimmermann, incorporated in 1916,
In its early years the company came into prominence with the design of the construction of the Gatun Lock System, one of the Panama Canal locks in 1907. The construction of the Gatun Lock began with the first concrete laid at Gatun, on August 24, 1909, by Day & Zimmermann. In 1914, the company was contracted by the Hershey chocolate company to produce the foil wrapping machines for Hershey's Kisses.
Merger with Yoh Services and later years
In 1961, Day & Zimmermann and Yoh Company merged, with Harold L. Yoh becoming president of Day & Zimmerman. In the early 1970s it assisted in the construction of Veteran's Stadium in Philadelphia.
From Wikipedia’s article on Day & Zimmermann, shared under CC BY-SA 4.0.2