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The Keaton Music Typewriter, a machine used to print musical manuscripts, was in production in the mid-20th century. The 33 key version was patented in 1953.
Here's a link to the patent.
This machine is unusual in that the paper goes underneath the machine and lies flat. The original machine was sold for $225.
If your machine is in excellent cosmetic and functioning condition, the current retail (replacement or insurance) value of your musical typewriter is approximately $6,000.
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