Jérôme Knebusch on Twitter: "ANRT (back) at Klingspor Archives Offenbach. The Story of the foundry begins with this 7, which gave birth to the Eckmann type (here with smoke proof). https://t.co/StxTbrm158" /
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Conversion of self-contained breathing apparatus mask to open source powered air-purifying particulate respirator for fire fighter COVID-19 response - HardwareX
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