Flat, rectangular celluloid advertisment card for the Dearborn Chemical Company's Boiler Feed Water Treatment, which "prevents scale, corrosion and foaming." A calendar for 1931 is on the front.
One side of this celluloid card has a calendar for 1931, and an advertisement for the Boiler Feed Water Treatment made by the Dearborn Chemical Company. The other side lists several Dearborn products.
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