Improved apparatus to provide for the inhaling of fresh air in vitiated atmospheres / [Emil Witzenmann].

Improved apparatus to facilitate breathing in dust-laden or vitiated atmospheres / [Emil Witzenmann].

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Witzenmann, Emil.

Works from the collections

Improved apparatus to provide for the inhaling of fresh air in vitiated atmospheres / [Emil Witzenmann].

Improved apparatus to facilitate breathing in dust-laden or vitiated atmospheres / [Emil Witzenmann].