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The birth of object-oriented programming is often traced back to Simula 67, which was released in -- you guessed it -- 1967. However, I recently encountered an example that goes back even further. That example is in the Data Control Block (DCB) that was an integral part of the user interface to IBM's mainframe operating system, OS/360, that I believe first saw the light of day in 1964. I haven't kept in touch with that system's successors, but I would be surprised if a similar data structure does not still exist today.