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Category:Mechanical calculators - Wikimedia Commons
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Vintage 1960s MAGIC BRAIN Pocket Mechanical Addiator
![](https://i.ytimg.com/vi/fe-9uTVMQlo/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLD7TTRasYzjptT5Bg0Lcpclp7kMbw)
Magic Brain: Last Gasp of the Mechanical Calculator
National Museum of American History
![](https://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Microcifra_10_and_UNITREX_90SC.jpg/120px-Microcifra_10_and_UNITREX_90SC.jpg)
Category:Calculators - Wikimedia Commons
![](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Vintage_Brother_Pro-Cal_408_Electronic_Pocket_Calculator%2C_9-Tube_Display%2C_Sealed_Battery%2C_Made_In_Japan%2C_Circa_1972_%2813994075998%29.jpg/103px-Vintage_Brother_Pro-Cal_408_Electronic_Pocket_Calculator%2C_9-Tube_Display%2C_Sealed_Battery%2C_Made_In_Japan%2C_Circa_1972_%2813994075998%29.jpg)
Category:Calculator collection by Joe Haupt (from Flickr stream
Category:Mechanical calculators – Wikimedia Commons
![](https://i.ytimg.com/vi/aDN4s8ElxqE/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLBRaXTpIW6DMo681CMJ1_P_CKEKvw)
Magic Brain: Last Gasp of the Mechanical Calculator
![](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Vintage_Casio_Color_Power_Graphic_Scientific_Calculator%2C_Model_CFX-9970G%2C_Made_in_Japan%2C_Introduced_In_1997_%2832595351534%29.jpg/98px-Vintage_Casio_Color_Power_Graphic_Scientific_Calculator%2C_Model_CFX-9970G%2C_Made_in_Japan%2C_Introduced_In_1997_%2832595351534%29.jpg)
Category:Calculator collection by Joe Haupt (from Flickr stream
![](https://i.ytimg.com/vi/01tqrXtF_LA/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-BIAC4AOKAgwIABABGFMgXChlMA8=&rs=AOn4CLDevQ0BOqW9o2O3Y17xKfkhnyNoSg)
Magic Brain Calculator - How to Add
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