400 / | HD | TYPEWRITING MACHINES |
61 | DF | INCLUDING CONTROL OF FORMAT AND SELECTION OF TYPE-FACE BY PROGRAMMED CONTROL-SYSTEM (E.G., INPUT TYPEWRITER) {7} |
67 | DF | .~ Separate interrelated programs {1} |
68 | .~.~ Including message writing (e.g, address program, form-letter program, etc.) |