<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["en", "en"].<end_of_turn>
<start_of_turn>user
When was the gas mask invented?<end_of_turn>
<start_of_turn>model
The gas mask was invented by a Scotsman named John Stenhouse in 1854. This gas mask was already capable of filtering gases toxic to humans which circulated in the air. John Stenhouse realized at the time that certain charcoals were able to stop harmful particles. He then invented a strangely shaped mask which contained filters made of small pieces of charcoal. Its effectiveness was proven and factories began to acquire it to protect workers from toxic fumes and they no longer inhaled gas.<end_of_turn><eos>