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Fearns/M.H. Mear of Great Britain still makes special-purpose circular rules : Calculators - heating, lighting, fluid flow http://www.mhmear.com/polsen51
I've got a stumper. As previously noted, I purchased a Lutz 151c (Bamboo - probably made by Ricoh) that had a noticeable gap (I'd say around 1mm) I had alsotdewey100
The International Slide Rule Group "ISRG" is devoted to collectors of slide rules and associated mechanical calculating instruments.
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If you are serious about slide rule collecting, it is highly recommended that you consider joining
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Cyril Catt -
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Jerome Mc Kenna
Slide rules are THE ORIGINAL solar powered calculators. Try using one in the dark and you'll see I'm right, or not see as the case may be.
This is your groupowners attempt at humor.
- Dec 21, 1998
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