Additional symbol equipment for spherical head typewriter - has extra keyboard mounted over main one for different head

摘要

The equipment allos typing of additional symbols on a spherical-head type typewriter. An additional keyboard (3) with the special symbols on it is secured by means of grips into the main one (7), and is used in conjuction with a corresponding spherical head. The keyboard can be held in place by magnets on the main one, being maintained in the correct position by two dowels. Means can also be provided for hinging it upwards, so as to go back to the main keyboard after changing heads again.