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Old 01-10-19, 05:05 PM
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crank_addict
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In the vintage scheme of topic, it would be fun to discover oddity or prototype parts. One from the 1970s would be Allen Armstrong's Positech variable leverage caliper. Patented but somehow never made it to market.

Here's a write up of it:
Cozy Beehive: Conversations With David Gordon Wilson : Part IV
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