400 / | HD | TYPEWRITING MACHINES |
191 | DF | INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15} |
237 | DF | .~ Ribbon, per se {4} |
241 | .~.~ Particular ribbon material {3} | |
241.1 | DF | .~.~.~> Synthetic material {1} |
241.3 | DF | .~.~.~> Particular weave pattern |
241.4 | DF | .~.~.~> Including ink-impervious backing for ribbon |