| 708 / | HD | ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING |
| 100 | DF | ELECTRICAL DIGITAL CALCULATING COMPUTER {10} |
| 200 | DF | .~ Particular function performed {26} |
| 490 | DF | .~.~ Arithmetical operation {27} |
| 670 | DF | .~.~.~ Addition/subtraction {11} |
| 679 | | .~.~.~.~ Magnetic |