The Hansen Writing Ball was invented in 1865 by the reverend and principal of the Royal Institute for the deaf-mutes in Copenhagen. The writing ball was first patented and entered production in 1870, and was the first commercially produced typewriter. In Danish it was called the skrivekugle. The Hansen ball was a combination of unusual design and ergonomic innovations, but like most of the early 19th century typewriters, it did not allow the paper to be seen as it passed through the device.
The Daily Omnivore 
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