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A black and white photograph showing a large group of men in business suits, the Rockford Engineering Society, posing on a huge industrial machine at Ingersoll Milling Machine Co.

A photograph depicting several men in business suits on a large industrial machine at Ingersoll Milling Machine Company, 2400 Douglas, Rockford IL. Carl Erbe is the sixth figure from the left in a light jacket with his hands on controls in the…