The half masks in my collection. Top row, right to left, MSA Dustfoe #66, MSA Comfo (the 1937 type), modern MSA Comfo (heavily damaged). The mask on the bottom is the US
MSA Dustfoe 66 Respirator for Dusts Mists W/metal Box & Filters NOS - Etsy UK
MSA Dustfoe respirator with MSA gastight goggles. : r/gasmasks
Vintage Mining Appliance “Dustfoe” Mid Century Tool by MSA in Tin | eBay
Old Vtg Miners Mining MSA Dustfoe #55 Respirator Dust Mask Metal Tin | eBay