Obsolete calculator
Else clues• Antiquated calculator
• Calculator ancestor
• Calculator predecessor
• Instrument with scales
• Low-tech calculator
• Obsolete calculating tool
• Obsolete math aid
• Obsolete math-class tool
• Old math calculating tool
• Old tool for working on logs
• Outdated math geek's tool
• Pocket calculator predecessor
• Pre-calculator calculator
• Tool once used with logs