| Answer | Crossword Clue |
|---|---|
| ABACUS | Kind of calculator |
| ABACUS | Calculator of a kind |
| ABACUS | Type of calculator |
| ABACUS | Calculator of old |
| ABACUS | Calculator of a sort |
| ACTUARY | Calculator of insurance statistics. |
| ARCHIMEDES | Early calculator of pi |
| ABACUS | Ancestor of a calculator |
| PASCAL | Inventor of first digital calculator |
| PASCAL | Inventor of the first digital calculator |
| PASCAL | Inventor of a 17th-century calculator |
| CASIO | Maker of the first electric compact calculator |
