25 IBM 604 Vintage / Antique Computer Pluggable Units / Tube Assemblies Pre Syst | #1823597027
UvA Computermuseum
Examining a technology sample kit: IBM components from 1948 to 1986 - SemiWiki
7 IBM ideas | ibm, computer history, vacuum tube
IBM Catches Up - CHM Revolution
IBM | SpringerLink
Pluggable Units of the IBM 604 calculator
IBM100 - IBM 603
6.8 Building the first IBM computers | Bit by Bit
An 8-tube module from a 1954 IBM mainframe examined: it's a key debouncer
About the Computer History Museum's IBM 1401 Machines - CHM
IBM 604 - Wikipedia
25 IBM 604 Vintage / Antique Computer Pluggable Units / Tube Assemblies Pre Syst | #1823597027
A December 1951 advertisement for the IBM 604 Electronic Calculating Punch that was first produced in 1948. The machine could be programed to do addition, subtraction, multiplication and division. The advertisement claims
IBM 650 - Wikipedia
What did all the blinking lights and switches in the panels of early computers (e.g.,IBM 604) mean? - Quora
IBM-604
Pluggable Units of the IBM 604 calculator
7 IBM ideas | ibm, computer history, vacuum tube
IBM100 - IBM 603
Examining a technology sample kit: IBM components from 1948 to 1986
