Related Clues

• Obsolete math aid
• Old tool for working on logs
• Old math calculating tool
• Tool once used with logs
• Calculator predecessor
• Pre-calculator calculator
• Obsolete calculator
• Obsolete math-class tool
• Calculator ancestor
• Obsolete calculating tool
• Antiquated calculator
• Calculator's ancestor?
• Pocket calculator predecessor
• Old style caculator
• Old calculator
• Calculating device
• Tool for obtaining products made with logs
• Old engineering tool
• Outdated math geek's tool
• Mathematical device