701 / | HD | DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION |
1 | DF | VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19} |
99 | .~ With indicator or control of power plant (e.g., performance) {2} | |
100 | DF | .~.~> Gas turbine, compressor |
101 | DF | .~.~> Internal-combustion engine {1} |