| 700 / | HD | DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS |
| 90 | DD | SPECIFIC APPLICATION, APPARATUS OR PROCESS {16} |
| 275 | | .~ Mechanical control system {5} |
| 276 | DD | .~.~> HVAC control {2} |
| 279 | DD | .~.~> Balancing or alignment |
| 280 | DD | .~.~> Vibration or acoustic noise control |
| 281 | DD | .~.~> Control of fluid level or volume |
| 282 | DD | .~.~> Flow control (e.g., valve or pump control) {2} |