Apple Mac mini A1347 Desktop - MD387B/A
Can I find a User Manual for this Mini
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The user manual will be for the specific macOS version it is running, not the computer model itself.
That model number corresponds to a 2012 Mac mini which can run anything from macOS 10.8 Mountain Lion to 10.15 Catalina.
You can find the Late 2012 Mac mini Quick Start Guide here: https://manuals.info.apple.com/MANUALS/1000/MA1631/en_US/mac_mini-late-2012-quick_start.pdf
and the user manuals for macOS 10.13 to 10.15 here: Link-> Get to know the Mac desktop - Apple Support