Although chiefly known as a contractor/builder, William F. Koelle begins his listings in the Philadelphia city directories as an architect (1899-1900). He was associated with several architectural and contracting firms during the period of his greatest activity, including William F. Koelle & Co., 1902-1904, and Koelle, Speth & Co., 1904-1916. From 1921 onward William F. Koelle & Co. returns as a contracting firm.
Sandra L. Tatman.
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