If someone wrote a correct, useful algorithm back then it could very easily still exist today. Absolutely. The oldest code I ever came across was the basic algorithms for modelling a super-conductor quenching. I think the original version was written at Rutherford-Appleton Laboratory in about 1968.
The basic algorithm is still in use today, and at least 50% of all supercon MRI magnets were designed using it.
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The basic algorithm is still in use today, and at least 50% of all supercon MRI magnets were designed using it.