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"I never saw why I had to give up science in order to write, or the other way around, so I didn't!"
- Gregory Benford

Specialized Prosthetic Arm  
  A set of prosthetics that provide different functionality in place of missing arm.  

Mannie O'Kelly-Davis, the computer tech in the lunar prison, has a mechanical arm with a number of different attachments.

...I have something specialists don't have: my left arm.

You see, from elbow down I don't have one. So I have a dozen left arms, each specialized, plus one that feels and looks like flesh. With proper left arm (number-three) and stereo loupe spectacles I could make ultramicrominiature repairs that would save unhooking something and sending it Earthside to factory - for number-three has micromanipulators as fine as those used by neurosurgeons.

From The Moon is a Harsh Mistress, by Robert Heinlein.
Published by GP Putnam in 1966
Additional resources -

Compare to the interchangeable hands from Philip K. Dick's 1965 novel The Three Stigmata of Palmer Eldritch.

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Additional resources:
  More Ideas and Technology from The Moon is a Harsh Mistress
  More Ideas and Technology by Robert Heinlein
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  Tech news articles related to works by Robert Heinlein

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