Royal Model KMM, ca 1940

The Royal Typewriter Company manufactured this Royal Magic Margin typewriter around 1940. The typewriter’s patented Magic Margin design allowed the typist to set both the left and right hand margins with a simple push of a lever. With easy margin-switching, the Royal KMM could easily address envelopes, tabulate figures, and create tables.
The Royal Typewriter Company was founded in 1906 by Thomas Fortunes Ryan and Edward B. Hess, with Ryan providing the capital and Hess providing the inventiveness. Hess owned over 150 patents, many of which were assigned to the Royal Typewriter Company. Hess’s most noteworthy patents related to increasing the ease of typing, including an accelerating typebar, anti friction roller escapement, Magic Margins, and selective touch control.
date made
Royal Typewriter Company
overall: 9 in x 10 in x 14 1/2 in; 22.86 cm x 25.4 cm x 36.83 cm
ID Number
accession number
catalog number
Credit Line
Royal Typewriter Co., Inc.
See more items in
Work and Industry: Mechanisms
Computers & Business Machines
American Enterprise
American Enterprise
Exhibition Location
National Museum of American History
Data Source
National Museum of American History


My mother used one as a dissertation typist in the late 1940s-early 1950s. Incredibly rugged. She could type 90 wpm without mistakes. Unimaginable in these days of light-touch computer keyboards.
The Royal Model KMM were used by the clerks at SHAEF during WWII.

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