American Optical x Black Spray: December 1947

The Optical Journal - Optical News With Independent Views

Modern Mechanix December 1947: Black Spray of carbon is blown into the face of this industrial worker to test the efficiency of a respirator incorporating a revolutionary new dust filter. The mask was developed by the American Optical Company to protect laborers exposed to microscopic poisonous and disease-producing
dusts smaller in diameter than 24 millionths of an inch.

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