The Chicago Typewriter is a revision of the earlier Munson machine, first
patented in 1889. The Chicago uses a type-sleeve, a cylinder embossed with
type and mounted lengthwise on a horizontal shaft at the printing point.
When pressing a key, the type-sleeve rotates and shifts horizontally to
bring the correct letter into position. A hammer at the rear whacks the
paper against the type-sleeve with the ribbon in between.
The Chicago was made under many different brand names: Draper, Yale, Conover,
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