What is the first commercially succeeded typewriter? Is it different in Denmark or in US?

What is the first commercially succeeded typewriter in the world?
Is it different in Denmark or in US?

THE AMERICAN TYPE WRITER （1868）

Writing Ball(1870)
This is a quiz for you in Denmark. Which is the first commercial typewriter in the world?

Frequent letter pairs of adjacent typebars when typebars line in alphabetical order

Frequent letter pairs when typebars lines in alphabetical order
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