| | CLASS NOTES |
| 1 | DF | PROCESSES {5} |
| 15.1 | DF | HIGHSPEED FLUID INTAKE MEANS (E.G., JET ENGINE INTAKE) {1} |
| 38 | DF | CONTROL BY CHANGE OF POSITION OR INERTIA OF SYSTEM {5} |
| 47 | DF | SPEED RESPONSIVE VALVE CONTROL {5} |
| 59 | DF | FREEZE CONDITION RESPONSIVE SAFETY SYSTEMS {3} |
| 65 | DF | COMBUSTION FAILURE RESPONSIVE FUEL SAFETY CUT-OFF FOR BURNERS {1} |
| 67 | DF | DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2} |
| 78.1 | DF | AMBIENT CONDITION CHANGE RESPONSIVE {4} |
| 803 | DF | FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM) {11} |
| 82 | DF | PRESSURE MODULATING RELAYS OR FOLLOWERS {3} |
| 87.01 | DF | SELF-PROPORTIONING OR CORRELATING SYSTEMS {8} |
| 123 | DF | SIPHONS {8} |
| 154 | DF | DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7} |
| 215 | DF | BACK FLOW PREVENTION BY VACUUM BREAKING (E.G., ANTI-SIPHON DEVICES) {1} |
| 219 | DF | LARNER-JOHNSON TYPE VALVES; I.E., TELESCOPING INTERNAL VALVE IN EXPANDED FLOW LINE SECTION {2} |
| 223 | DF | INFLATABLE ARTICLE (E.G., TIRE FILLING CHUCK AND/OR STEM) {6} |
| 234.6 | DF | WITH VEHICLE GUIDE OR SUPPORT, E.G., SERVICE STATION |
| 236.1 | DF | DISTRIBUTION SYSTEMS INVOLVING GEOGRAPHIC FEATURES |
| 237 | DF | WITH CLEANER, LUBRICATION ADDED TO FLUID OR LIQUID SEALING AT VALVE INTERFACE {2} |
| 247 | DF | WITH LIQUID VALVES OR LIQUID TRAP SEALS {3} |
| 255 | DF | PLURAL TANKS OR COMPARTMENTS WITH PARALLEL FLOW {8} |
| 268 | DF | WITH HOLDER FOR SOLID, FLAKY OR PULVERIZED MATERIAL TO BE DISSOLVED OR ENTRAINED |
| 269 | DF | CONVERTIBLE {3} |
| 272 | DF | HYDRANT TYPE {15} |
| 309 | DF | REVERSING VALVES - REGENERATIVE FURNACE TYPE {2} |
| 312 | DF | WITH LEAKAGE OR DRIP COLLECTING {2} |
| 315 | DF | WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6} |
| 330 | DF | NON-VALVING MOTION OF THE VALVE OR VALVE SEAT {1} |
| 334 | DF | WITH HEATING OR COOLING OF THE SYSTEM {6} |
| 342 | DF | WITH FLUID SYSTEM SUPPORT FOR WORKMAN OR NON-SYSTEM MATERIAL |
| 343 | DF | WITH CASING, SUPPORT, PROTECTOR OR STATIC CONSTRUCTIONAL INSTALLATIONS {7} |
| 383 | DF | WITH LOCK OR SEAL {3} |
| 386 | DF | LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11} |
| 454.2 | DF | REMOVABLE VALVE HEAD AND SEAT UNIT {3} |
| 455 | DF | LINE CONDITION CHANGE RESPONSIVE VALVES {11} |
| 544 | DF | WITH MEANS FOR SEPARATING SOLID MATERIAL FROM THE FLUID {5} |
| 551 | DF | WITH INDICATOR, REGISTER, RECORDER, ALARM OR INSPECTION MEANS {6} |
| 560 | DF | COMBINED |
| 561 R | DF | SYSTEMS {32} |
| 797 | DF | FRANGIBLE |
| 798 | DF | WITH COUPLING {1} |
| 800 | DF | WITH CLOSURE |
| 801 | DF | FAUCETS AND SPOUTS |
| 802 | DF | MISCELLANEOUS |
| | ****************************** |
| | CROSS-REFERENCE ART COLLECTIONS |
| | ****************************** |
| 900 | DF | BUMPLESS MANUAL TO AUTOMATIC RELAYS |
| 901 | DF | BIASED BALL VALVES WITH OPERATORS |
| 902 | DF | SLUSH PUMP CHECK VALVES |
| 903 | DF | RUBBER VALVE SPRINGS |
| 904 | DF | CUSHION CHECK VALVES |
| 905 | DF | ROTARY VALVES FOR MULTIPLE GAS BURNERS |
| 906 | DF | VALVES BIASED BY FLUID "SPRINGS" |
| 907 | DF | VACUUM-ACTUATED VALVES |
| 908 | DF | RESPIRATOR CONTROL |
| 909 | DF | MAGNETIC FLUID VALVE |
| 910 | DF | DESTRUCTIBLE OR DEFORMABLE ELEMENT CONSTRUCTED OF SPECIFIC MATERIAL |
