Encyclopedia Dubuque
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Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
MULLEN BROS. & COMPANY
MULLEN BROS. & COMPANY. In 1892 Daniel P. Mullen organized the firm of Mullen Brothers. The four brothers constituting the partnership were Richard D., John, Michael and Daniel P. This continued unchanged until 1899, when, owing to the retirement of John and Michael, Richard D. and Michael continued the company. Their plumbing business had offices and a warehouse at 1036 Main.
The 1934 and the 1941 Dubuque City Directory listed 1036 Main.
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Source:
Oldt, Franklin T. The History of Dubuque County.