| | CLASS NOTES |
| 1 | DF | ELECTRIC MOTOR WITH NONMOTOR DRIVING MEANS (E.G., AXLE DRIVE, MANUAL DRIVE) {1} |
| 3 | DF | WITH PARTICULAR MOTOR-DRIVEN LOAD DEVICE {4} |
| 16 | DF | SUPPLIED OR CONTROLLED BY SPACE-TRANSMITTED ELECTROMAGNETIC OR ELECTROSTATIC ENERGY (E.G., BY RADIO) |
| 17 | DF | PORTABLE-MOUNTED MOTOR AND/OR PORTABLE-MOUNTED ELECTRICAL SYSTEMS THEREFOR |
| 560 | DF | POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23} |
| 689 | DF | Torquing motors |
| 690 | DF | SELF-SYNCHRONOUS TYPE OF MOTOR {5} |
| 696 | DF | OPEN-LOOP STEPPING MOTOR CONTROL SYSTEMS |
| 34 | DF | PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22} |
| 114 | DF | IMPACT, MECHANICAL SHOCK, OR VIBRATION-PRODUCING MOTORS |
| 115 | DF | MOTOR WITH DIVERSE MOTIONS (E.G., ROTARY AND RECIPROCATING) |
| 116 | DF | NONMAGNETIC MOTOR {1} |
| 118 | DF | MAGNETOSTRICTIVE MOTOR |
| 119 | DF | RECIPROCATING OR OSCILLATING MOTOR {4} |
| 135 | DF | LINEAR-MOVEMENT MOTORS |
| 136 | DF | AUXILIARY MEANS FOR PRODUCING MECHANICAL STARTING OR ACCELERATING TORQUE {1} |
| 138 | DF | SPACE-DISCHARGE-DEVICE COMMUTATED MOTOR |
| 139 | DF | BATTERY-FED MOTOR SYSTEMS |
| 140 | DF | GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL {9} |
| 159 | DF | HAVING ROTOR ELEMENT BIASED AGAINST ROTATION {1} |
| 161 | DF | WITH FLYWHEEL OR MASSIVE ROTARY MEMBER |
| 162 | DF | CONTROL BY PATTERNS OR OTHER PREDETERMINED SCHEDULE MEANS {1} |
| 700 | DF | SYNCHRONOUS MOTOR SYSTEMS {7} |
| 725 | DF | REPULSION MOTOR SYSTEMS {1} |
| 727 | DF | INDUCTION MOTOR SYSTEMS {12} |
| 244 | DF | ALTERNATING CURRENT COMMUTATING MOTORS {1} |
| 246 | DF | SERIES MOTORS {4} |
| 253 | DF | HOMOPOLAR OR UNIFORM FIELD MOTORS |
| 254 | DF | SELF-COMMUTATED IMPULSE OR RELUCTANCE MOTORS |
| 255 | DF | PLURAL DIVERSE MOTOR CONTROLS {4} |
| 280 | DF | MOTOR-REVERSING {4} |
| 362 | DF | BRAKING {7} |
| 383 | DF | "ANTI-BRAKING" OR BRAKING-PREVENTION MEANS |
| 430 | DF | MOTOR LOAD, ARMATURE CURRENT OR FORCE CONTROL DURING STARTING AND/OR STOPPING {1} |
| 432 | DF | CONSTANT MOTOR CURRENT, LOAD AND/OR TORQUE CONTROL {1} |
| 434 | DF | LIMITATION OF MOTOR LOAD, CURRENT, TORQUE OR FORCE (E.G., PREVENTING OVERLOAD) |
| 436 | DF | NONRUNNING, ENERGIZED MOTOR |
| 437 | DF | PHASING OR ANGULAR OR LINEAR POSITIONAL CONTROL OF MOVABLE ELEMENT OF THE MOTOR |
| 438 | DF | POWER FACTOR CONTROL OF ARMATURE OR LINE CIRCUIT |
| 439 | DF | MOTOR COMMUTATION CONTROL SYSTEMS |
| 440 | DF | HAVING PLURAL, DIVERSE OR DIVERSELY CONTROLLED SOURCES {2} |
| 443 | DF | PERIODIC, REPETITIOUS OR SUCCESSIVE OPERATIONS CONTROL OF MOTOR, INCLUDING "JOG" AND "INCH" CONTROL {1} |
| 445 | DF | AUTOMATIC AND/OR WITH TIME-DELAY MEANS (E.G., AUTOMATIC STARTING AND/OR STOPPING) {20} |
| 490 | DF | WITH SIGNALS, METERS, RECORDERS OR TESTING DEVICES |
| 491 | DF | CONTROL OF BOTH MOTOR CIRCUIT AND MOTOR STRUCTURE |
| 492 | DF | MOTOR MAGNETIC ENERGY DISSIPATION |
| 493 | DF | CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT |
| 494 | DF | ARMATURE (OR PRIMARY) CIRCUIT CONTROL {9} |
| 521 | DF | FIELD OR SECONDARY CIRCUIT CONTROL {6} |
| 538 | DF | MOTOR STRUCTURE ADJUSTMENT OR CONTROL {3} |
| 543 | DF | THREE-OR-MORE-POSITIONS MOTOR CONTROLLER SYSTEMS {6} |
| 558 | DF | MISCELLANEOUS |
| | **************************** |
| | DIGEST |
| | **************************** |
| DIG 2 | DF | Windshield wiper controls |
