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Model Citizen
Join Date: May 2007
Location: The Voodoo Lounge
Posts: 19,566
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Might be something from the printing trade where you use it to measure a stack (or 'lift') of paper for a sheet fed press or bindery equipment. The thumbscrew would hold a blade in that square opening.
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"I would be a tone-deaf heathen if I didn't call the engine astounding. If it had been invented solely to make noise, there would be shrines to it in Rome"
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