Pondering Two Inventions

The Puzzler

RAY: This week's puzzler is historical in nature, and it doesn't need any additional obfuscation or declarification. It has built-in obfuscation. Here it is:

I'm thinking of two inventions from long ago. One of them has thousands of moving parts. The other has one part, and it doesn't move.

They both do the same thing.

TOM: Are they still around?

RAY: Of course. Are they still in widespread use? Of course not.

What am I thinking of?

Think you know? Drop Ray a note!

[ Car Talk Puzzler ]

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