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Four variations of what I believe to be U.S Dog Gas Masks, these would later be replaced by the M6-12-8 Dog Mask. Bottom right has the look of a Navy Diaphragm slightly. :
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WWI Model of Horse Head Wearing Gas Mask For Sale at 1stDibs | ww1 dog gas mask, dog gas mask ww1, paper mache gas mask
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Amazon.com : K9 Mask® Air Filter Mask for Dogs with 'Extreme Breathe' PM2.5 Premium Air Filter Refills - Blue (Medium) : Pet Supplies
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