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The Model B was the successor to the Model A and met the requirements much better.
The mouth and nose piece are made of iron wire with linen, and comes out on a can with granules of soda lime. This absorbs some types of poison gas.
The Model B was the first Dutch-issued gas mask with a filter canister, and because of its striking shape it quickly got the nickname pig snout. However, developments went fast and already in 1917 the Model B was replaced by the Model C, which had a more extensive filter and protected against more types of gas.