File:Vintage Circular Mechanical Dial Engineering Calculator.jpg
Summary
| Description |
English: Circular Slide Rule, Wood and celluloid, 1920's, Germany, K. Emil Tröger
Deutsch: Logarithmische Rechenscheibe von K. Emil Tröger, Mylau/Vogtland um 1920 |
| Date | |
| Source | Own work |
| Author | Mister rf |
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