What slogan and date mark the effective end of the complex invention phase and the beginning of photography as widespread popular activity?

Answer

“You press the button, we do the rest” in 1888.

George Eastman and Kodak introduced flexible roll film with the Kodak No. 1 in 1888, accompanied by the slogan “You press the button, we do the rest,” marking the transition to popular photography.

What slogan and date mark the effective end of the complex invention phase and the beginning of photography as widespread popular activity?
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