(under subclass 545) Subject matter wherein the typewriter is provided with mechanism to effect incremental rotation of the platen* in response to a depression of a key* on the key-board* of the typewriter.
(1) Note. In most typewriters having a key-operated line-space* mechanism the power to effect the line-spacing is electrical power from an external source. A non-electric or manual typewriter is usually provided with a line-space lever that is powered by the hand of the typist.
