| 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} |
| 828 | ![]() | .~.~.~ Having simultaneous calculation of another function |