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A portable device used to counteract poisonous gases, being carried on a man's back. Halftone.

Decontamination of materials : air raid precautions handbook no. 4 / Home Office, Air Raid Precautions Dept.

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Decontamination (from gases, chemicals, etc.)

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Decontamination of materials : air raid precautions handbook no. 4 / Home Office, Air Raid Precautions Dept.

A portable device used to counteract poisonous gases, being carried on a man's back. Halftone.