| | CLASS NOTES |
| 1 | DF | CATHODE RAY TUBE CIRCUITS {11} |
| 500 | DF | HIGH ENERGY PARTICLE ACCELERATOR TUBE {3} |
| 32 | DF | COMBINED LOAD DEVICE OR LOAD DEVICE TEMPERATURE MODIFYING MEANS AND ELECTRICAL CIRCUIT DEVICE STRUCTURE {19} |
| 76 | DF | SPECIAL APPLICATION {2} |
| 84.51 | DF | PULSE STORING SYSTEMS OF THE GASEOUS DISCHARGE-TUBE TYPE {1} |
| 85 | DF | WITH ELECTROMAGNETIC WAVE RADIATION PREVENTING OR SHIELDING MEANS |
| 86 | DF | AUTOMATIC SUBSTITUTION OF THE POWER SUPPLY {1} |
| 88 | DF | AUTOMATIC SUBSTITUTION OF THE LOAD DEVICE OR ELECTRODE {5} |
| 94 | DF | WITH CATHODE OR CATHODE HEATER SUPPLY CIRCUIT {6} |
| 108 | DF | CONFINED GAS OR VAPOR-TYPE LOAD DEVICE WITH PRESSURE REGULATING MEANS {2} |
| 111.01 | DF | DISCHARGE DEVICE LOAD WITH FLUENT MATERIAL SUPPLY TO THE DISCHARGE SPACE {3} |
| 112 | DF | WITH LOAD DEVICE TEMPERATURE MODIFIER {4} |
| 119 | DF | WITH AUTOMATIC SHUNT AND/OR CUTOUT {6} |
| 129 | DF | WITH SIGNAL, INDICATOR, OR ALARM {5} |
| 137 | DF | POLYPHASE A.C. SUPPLY {4} |
| 149 | DF | WITH RADIANT ENERGY SENSITIVE CONTROL MEANS {8} |
| 160 | DF | PLURAL POWER SUPPLIES {8} |
| 177 | DF | LOAD DEVICE IN THE PRIMARY AND SECONDARY CIRCUIT OF THE SUPPLY TRANSFORMER |
| 178 | DF | PLURAL DIVERSE-TYPE LOAD DEVICES {2} |
| 184 | DF | THREE OR MORE LOAD DEVICES CONNECTED BETWEEN DIVERSE PAIRS OF PAIRED CONDUCTORS |
| 185 R | DF | PLURAL SERIES CONNECTED LOAD DEVICES {7} |
| 194 | DF | REGULATION OF THE CONTROL CURRENT AND/OR POTENTIAL APPLIED TO DISCHARGE CONTROL DISCHARGE DEVICE LOADS BY PHASE SHIFTING MEANS {2} |
| 200 R | DF | DISCHARGE DEVICE AND/OR RECTIFIER IN THE SUPPLY CIRCUIT {7} |
| 209 R | DF | PERIODIC SWITCH IN THE SUPPLY CIRCUIT {11} |
| 227 R | DF | CONDENSER IN THE SUPPLY CIRCUIT {10} |
| 246 | DF | PULSATING OR A.C. SUPPLY {10} |
| 288 | DF | THREE OR MORE WIRE DISTRIBUTION SYSTEMS |
| 289 | DF | SURGE GENERATOR OR INDUCTANCE IN THE SUPPLY CIRCUIT {1} |
| 291 | DF | CURRENT AND/OR VOLTAGE REGULATION {7} |
| 312 | DF | PLURAL LOAD DEVICE SYSTEMS {3} |
| 326 | DF | DISCHARGE DEVICE LOAD {8} |
| 359 | DF | PYRO-ELECTRIC DEVICE LOAD |
| 360 | DF | TIME-CONTROLLED |
| 361 | DF | PLURAL CONTROL STATIONS |
| 362 | DF | ELECTRIC SWITCH IN THE SUPPLY CIRCUIT |
| 363 | DF | MISCELLANEOUS SYSTEMS |
| | ****************************** |
| | DIGESTS |
| | ****************************** |
| DIG 1 | DF | Fluorescent lamp circuits with more than two principle electrodes |
| DIG 2 | DF | High frequency starting operation for fluorescent lamp |
| DIG 3 | DF | Circuit for ion gauges and pressure gauges |
| DIG 4 | DF | Dimming circuit for fluorescent lamps |
| DIG 5 | DF | Starting and operating circuit for fluorescent lamp |
| DIG 7 | DF | Starting and control circuits for gas discharge lamp using transistors |
