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Lot numbers pictured on the gas mask canister helped investigators track down the airman.
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TORONTO-JUNE 26: A Toronto Riot Police Officer With His Gas Mask On, Photographing The Protesters During The G20 Protest On June 26, 2010 In Toronto, Canada. Stock Photo, Picture And Royalty Free
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Canadian Riot Police officer, using the Avon C50 gas mask during protests in Toronto. : r/gasmasks
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George Floyd protests: The police don't change.
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