IBM's Card programmed Computer/calculator (CPC). Type 941 Storage Unit, Type 412-418 Accounting Machine, Type 605 Electronic Calculator, Type 527 High-Speed Punch | 102646588 | Computer History Museum
The IBM 609 Calculator
List of IBM products - Wikipedia
The IBM 608 Calculator
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A look at the very early days of computing, IBM calculators in the 1950s. – Securitron Linux blog.
IBM Calculators
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IBM 3.5 inch Floppy Disk Solar Powered Calculator - UK Technology & Project Management Blog
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IBM Archives: IBM Relay Calculator
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File:IBM Automatic Sequence Controlled Calculator Sequence Indicators.jpg - Wikimedia Commons
BRL Report 1961
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