50s 60s Martindale Face Masks, Vintage Health Masks, Made in USA, Novelty Prop Movie Set - Etsy UK
martindale protective masks | Safetyshop
Martindale Dust Mask | Gas Mask and Respirator Wiki | Fandom
Industrial dust mask made by Martindale. Probably mid-late 1960s. More info in comments - including a somewhat comprehensive timeline of Martindale from 1928 to present day. : r/gasmasks
Those 70s Masks: The Martindale Protective Mask by dangerousair on DeviantArt
MARTINDALE MSA BREATHING APPARATUS MASK FRESH AIR BA CONFINED SPACE WASK GAS | eBay