It has five-point head harness and straps made from the same rubber as facepiece. It was made from tough black rubber and it had big glass lenses to provide better field of view. There is a model with long hose, short hose (this one), with voice-diaphgram, a version for rebreather and many more. So MSA invented the All-service mask and started to make a lot of variant of it. The main reason why this mask was even made is because in 1930’s USA needed a mask that would be universal and could be used in all kinds of situations where an industrial mask could be needed. It was manufactured by MSA (Mine safety appliences) factory in Pittsburgh and was used by firefighters, chemical facilities and miners. This mask was used since 1950’s till 1970’s but it’s design was first invented in 1930’s. MSA All-service model S industrial mask from 1957.
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