1900s, Drawing, Mask, Spirometer, Valve Spirometer, 1907, with breathing mask and one-way valves February 10, 2014 Richard Johnston Leave a comment From: German archive for clinical medicine , Volume 88, 1907, Page 391. Note the breathing mask and one-way valves. Note also the pen writing on graph paper which was apparently moved horizontally by a screw. Manufacturer unknown.