| 347 / | HD | INCREMENTAL PRINTING OF SYMBOLIC INFORMATION |
| 171 | DF | THERMAL MARKING APPARATUS OR PROCESSES {20} |
| 200 | DF | .~ Specific resistance recording element type {8} |
| 208 | DF | .~.~ Specific conductor means (e.g., electrode, conducting pattern, etc.) {1} |
| 209 | DF | .~.~.~ With means for driving or supplying current to the resistive heating elements {1} |
| 210 | | .~.~.~.~ Including switching means |