Title:
Protective breathing apparatus with regeneration of exhaled air
United States Patent 3390676

Inventors:
Ernst, Warncke
Hans, Haas
Publication Date:
07/02/1968
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Assignee:
Drager, Otto H.
Primary Class:
128/204.280
International Classes:
A62B7/02; A62B7/10; A62B9/02; A62B25/00; A62B7/00; A62B9/00
Foreign References:
GB372246A
GB724801A
DE891497C
GB878119A
DE1031137B
DE1141186B
DE1132802B