ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins57% CONFIDENCEOverall confidence: 57%How well the pin's source and references back up its dates.Weighted average of how firmly 8 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
Fondazione Henraux[8] and Quarry Magazine[7] both date the company's founding to 1821, but neither source gives a specific month or day.In 1821, landowner Marco Borrini and French businessman Jean-Baptiste Alexandre Henraux founded the Henraux marble company in Tuscany’s Apuan Alps. It still works the Monte Altissimo quarries first opened by Michelangelo in the 1500s and shown in Stone Men.
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