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 |