Where did users send their Kodak No. 1 cameras to have the film processed?

Answer

The Eastman factory in Rochester, New York

Upon exhausting the 100 exposures loaded into the Kodak No. 1, the user did not attempt to process the film personally. Instead, they mailed the entire camera back to the factory located in Rochester, New York. There, the company performed the necessary chemical processes to develop the images and print them, subsequently reloading the camera with fresh film before returning it to the owner.

Where did users send their Kodak No. 1 cameras to have the film processed?
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