Data Sheets and Photographs of Dust Respirator Models, Including an Experimental J-M and Willson Mask (c. 1970)

A 31-page set of typed data sheets, each followed by a photograph, for about fifteen dust respirators, giving the maker and model, U.S. Bureau of Mines approval schedule (or "unapproved"), total weight and sometimes the filter material. The masks include models by Cesco, Dupor, Pulmosan, Welsh, DeVilbiss and Flex-A-Foam, and an "experimental" JM-Willson mask with an acrylic and glass fiber filter.

What it shows

The JM-Willson entry suggests the set was probably made during Johns-Manville's work with Willson Products on a disposable dust mask; see G. P. Reimschussel, Disposable Dust Respirators, J-M Research Center Progress Report No. 2 (1971) and T. J. Weeks, Throwaway Mask for Fibrous Dusts, J-M Research Center Progress Report No. 1 (1969). See also Respirator and U.S. Bureau of Mines.