Improved apparatus for enabling a person to breath fresh air while surrounded with a poisonous or noxious atmosphere, more esecially for use in saving miners from being suffocated by choke damp or after damp / [Charles Addison Ash].
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Improved apparatus for enabling a person to breath fresh air while surrounded with a poisonous or noxious atmosphere, more esecially for use in saving miners from being suffocated by choke damp or after damp / [Charles Addison Ash]. Credit: Wellcome Collection. Public Domain Mark