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6d
The man behind the mask
Among those who found a path first was Dr. Cluny Macpherson, a Newfoundland doctor who devised an early gas mask — known as ...
BBC
5y
Millions of masks distributed to students in 'gas chamber' Delhi
Five million masks are being distributed at schools in India's capital, Delhi, after pollution made the air so toxic officials were ... had been turned into a "gas chamber".
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