Improvements in respirators
By: [R. G. C. Baldrey]
Contributors: Keymer, William James, patentee; G. F. Redfern & Co
Publisher: Printed for His Majesty's Stationery Office by Love & Malcomson, Ltd
Place of publication: Redhill
Language: eng
Notes: Patent specification.

Contains the complete specification.

Patent reference : 1904/28819.