Related Clues:
- Counters
- Old-style calculators
- You can count on them
- Precalculator calculators
- Pre-PC counters
- They give sum help?
- Early adders
- Low-tech calculators
- Nonvenomous adders?
- Primitive adders
- Ancient calculators
- Summers in the Far East?
- You can always count on them
- Slide rule precursors
- Simple adding devices