entry once and switching into a normal typing mode the typewriter is properly positioned with respect to the page for immediate rekeying of the heading or entry to provide centered copy application_number US 64425575 A description the detail description of the invention will be made based upon a typewriter of the type disclosed in u s pat no 3 892 304 to i d shakib but it should be understood that the concept and controls could be changed from a pneumatic control system to an electronic or mechanical control system using the appropriate equivalent such as transistor logic and switches or latches and mechanisms numerous references will be made to u s pat no 3 892 304 during the course of this disclosure fig2 of the shakib patent illustrates a schematic of the pneumatic controls for the keyboard 18 of the type of typewriter mechanism involved herein as can be seen from the drawing in the shakib patent a keyboard signal generator 26 provides signals to a logic block 28 the number of signals n designated by the lines 20 as an arbitrary number of input signals these signals are decoded combined and logically utilized to provide an increased number of output signals m the specific design of the logic block 28 is immaterial inasmuch as the same results.