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In page BINAC:

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Previous computers were the darlings of university departments of engineering; the users knew the machines well.[citation needed] The BINAC was going to go to an end user, and so a user manual was needed. Automobile "users" were quite accustomed in those days to doing significant servicing of their vehicles, and "user manuals" existed to help them. The BINAC manual writers took inspiration from those manuals when writing the user manual for the BINAC.[1]