3 treff

Use of a type of N, miners' gas mask
S.H. Katz and G.S. McCaa
Bok Engelsk 1929
Use of the miners' self-rescuer
S.H. Katz and J.J. Forbes
Bok Engelsk 1928
Use of carbon-monoxide gas masks in mines
S.H. Katz, G.S. McCaa and A.L. Barth
Bok Engelsk 1924