The Electric Typewriters Sound Effects Library is a composite collection of 4 and half (yes half, one machine was broken) (old) electric Typewriters.
You will find sounds ranging from opening/closing covers, pressing keys, random typing, electric motor movements of the writing head, mechanic-hammering of the letters, small mechanical levers and so on
All sounds were recorded with a Sennheiser MKH8050 through a UA Apollo 8 and a RODE NTG-3 through a Sound Devices 744T.
Of course the sounds can be ordinarily used for interfaces and, well, electric typewriters but they could also easily be mangled and mutilated for some great robotic and futuristic stuff.
Try it yourself.

This Sound Effects Library is fully UCS Compliant.
The Universal Category System is a public domain initiative for consistent categorization of Sound Effects.
For more information about the UCS visit the UCS-Website