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I'm not sure what you are asking about. If it is the internal CPU registers in which arithmetic/logic results and index values are stored, there have been machines with anywhere from zero to hundreds of registers built. Machines with zero registers store everything directly in main memory, so they need no CPU registers. A complete history of which machines, when, what registers, and how many; even without other architectural details would take thousands of pages to tabulate and would show no meaningful patterns. It is also very unlikely that such a history could be assembled as much of the documentation on many machines no longer exists. Companies like to destroy obsolete files to recover storage space for new files.
If you are asking for something else, please clarify and maybe an answer could be found.
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