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Different kinds of wood were tried, also nut shells including coconut shells lamp black, carbon black, blood, seaweed, and ivory nuts. The first coconut charcoal came from Dr. H. B. Lemon, of the University of Chicago, and by December, 1917, nut shells formed the basis of most of the charcoal used in gas masks. Making An N95 Mask For COVID-19 Coronavirus? What You Mar 29, 2020 · 1. The mask has to actually filter out the virus. The mask is called N95 and not N lets see what can and cant get through the mask. N95 means that the mask can f ilter out at least 95% Micarta (MICARTA) Phenolic Sheet Order Online3D Printing (3993-3D) Aerospace, Missile & Space (3760-AX) Aeseptic Sterile Beverage & Pharma Filling Systems (3823-BP) Aircraft Engines (5088-AE)

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