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https://www.righto.com/2017/12/repairing-1960s-era-ibm-keypunch.html?m=0
Repairing a 1960s-era IBM keypunch: controlled by mechanical tabs and bars
In this article I describe repairing an IBM 029 keypunch that wouldn't punch numbers. Keypunches were a vital component of punch card comput...
ibm keypunch