![Hungarian soldier wearing a new type of gas mask with a microphone to enable conversation during a gas attack. Nov. 10, 1939 Stock Photo - Alamy Hungarian soldier wearing a new type of gas mask with a microphone to enable conversation during a gas attack. Nov. 10, 1939 Stock Photo - Alamy](https://c8.alamy.com/comp/D18KFD/hungarian-soldier-wearing-a-new-type-of-gas-mask-with-a-microphone-D18KFD.jpg)
Hungarian soldier wearing a new type of gas mask with a microphone to enable conversation during a gas attack. Nov. 10, 1939 Stock Photo - Alamy
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