Solution
ABACUS
3 clues
Counting frame
- Word class
- Common noun
- Nature of clue
- Synonym
- Difficulty
- Easy
- Sources
- Boatload Puzzles
- Topics
- Maths Physics
Early calculator
- Word class
- Common noun
- Nature of clue
- Description
- Difficulty
- Easy
- Sources
- Boatload Puzzles
- Topics
- History, Maths Physics, Technology
- From which decade
- Older times
Manual calculator
- Word class
- Common noun
- Nature of clue
- Description
- Difficulty
- Easy
- Sources
- Boatload Puzzles
- Topics
- Maths Physics, Technology
Words are categorized by artificial intelligence: there can be mistakes.