Richard J Kinch wrote:
There's an odd thread, called the Leica thread, that is used on
photographic enlarger lenses. It is specified as 39mm in nominal diameter
but 26 tpi in pitch.

I'm wondering what other monstrous metric-English combinations are out
there?

I seem to remember that some European bicycle parts had similarly stupid
threads...

Paul

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It's a Linux world....well, it oughta be.
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