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In page Timeline of diving technology:
"
- Hans Hass and Hermann Stelzner of Dräger, in Germany made the M138 rebreather. It was developed from the 1912 escape set, a type of rebreather used to exit sunken submarines. The M138 sets were oxygen rebreathers with a 150 bar, 0.6 liter tank and appeared in many of his movies and books.[citation needed]
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