| 347 / | HD | INCREMENTAL PRINTING OF SYMBOLIC INFORMATION |
| 111 | DF | ELECTRIC MARKING APPARATUS OR PROCESSES {3} |
| 163 | DF | .~ By electrochemical {3} |
| 166 | | .~.~ Specific head {3} |
| 167 | DF | .~.~.~> Including motor for driving head |
| 168 | DF | .~.~.~> Including driving circuitry |
| 169 | DF | .~.~.~> Helix drum |