What Philadelphia firm made most of the manhole covers in Center City?
S.J. Cresswell Ironworks, in business from 1870 till 1969, is the name stamped on most of the manhole covers in town. The firm began operations on Race street, but latter moved to 23rd and Cherry Streets, where its old fitting-up shed still stands. Source: Workshop of the World: A Selective Guide to the Industrial Archeology of Philadelphia, 1990, p.
