| 165 / | HD | HEAT EXCHANGE |
| 200 | DF | WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14} |
| 272 | DF | .~ Control of heat pipe heat transfer characteristics {2} |
| 274 | ![]() | .~.~ Control of vapor or liquid flow between evaporator and condenser sections (e.g., by variable restrictions, check valves, etc.) |