| 708 / | HD | ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING |
| 800 | DF | ELECTRICAL ANALOG CALCULATING COMPUTER {1} |
| 801 | DF | .~ Particular function performed {15} |
| 823 | DF | .~.~ Integrator {10} |
| 833 | ![]() | .~.~.~ Amplifier with additonal feedback loop {1} |
| 834 | DF | .~.~.~.~> Additional R/C feedback loop |