Monotype Keyboard.

Mono_keybd

 A Monotype keyboard allows a keyboard operator to prepare a punched paper tape, called ribbon, that will direct the casting of type separately from its actual casting.
The keyboard on which the operator types is removable, as is a set of keybars under the keys; the keybars, corresponding to each key, determine which holes will be punched in the tape.
During operation, two sets of keys and keybars are placed in two side-by-side trays on the keyboard.
The keybars are adjustable, so that the coding of the keys can be changed.
Keytops also are replaceable, so that the keyboard can be reconfigured.
MG-5262,large

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