|
| 312 22 | AIR FILTRATION EQUIPMENT FOR AIRCRAFT, BOAT AND SHIP, CARGO CONTAINERS AND VEHICLES |
| 312 23 | AIR FILTRATION EQUIPMENT FOR SOFT AND HARD SHELTERS |
| 312 38 | ENVIRONMENTAL CONTROL SYSTEMS, AIRCRAFT |
| 312 39 | ENVIRONMENTAL CONTROL SYSTEMS FOR AUTOMOBILES, EMERGENCY VEHICLES, TRUCKS |
| 312 40 | ENVIRONMENTAL CONTROL SYSTEMS FOR BOATS, SHIPS, MARINE |
| 312 41 | ENVIRONMENTAL CONTROL SYSTEMS FOR CARGO CONTAINERS, ETC. |
| 312 43 | ENVIRONMENTAL CONTROL SYSTEMS, SPACECRAFT |
| 312 46 | ENVIRONMENTAL REMOTE CONTROL SYSTEMS |
| 312 48 | ENVIRONMENTAL TEST CHAMBERS AND ROOMS, CONTROLLED TEMPERATURE, HUMIDITY, ETC. |
| 312 83 | TENT SYSTEMS, FIELD, GROUND ZERO ENVIRONMENT |
| 312 84 | TENT UNITS, CONTAMINATED PATIENT ISOLATION, NEGATIVE PRESSURE |