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
By: [Charles Addison Ash]
Contributors: Watkins, Stephen, agent
Publisher: Printed for Her Majesty's Stationery Office by Darling and Son, Ltd
Place of publication: London
Language: eng
Notes: Patent specification.

Contains both the provisional and the complete specification.

Patent reference : 1893/13982.