A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mechanical-filter type of respirators
Respirators discussed in accordance with conventional classifications of atmospheric particulate matter, namely, dusts, fumes, and mists. From U S Dept Labor -- Bul n 21. (Cement Mill Sec)
Mechanical-filter type of respirators
Respirators discussed in accordance with conventional classifications of atmospheric particulate matter, namely, dusts, fumes, and mists. From U S Dept Labor -- Bul n 21. (Cement Mill Sec)
Mechanical-filter type of respirators
Concrete
Concrete ; 47
1939
Article (Journal)
English
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