72287992
Jan 2, 1968
Mar 11, 1969
LUNG EXERCISING DEVICE-NAMELY, AN APPARATUS INTENDED TO AID PERSONS IN THE DEVELOPMENT OF CONTRACTILE STRENGTH FOR THEIR LUNGS, TO INCREASE THE STRENGTH OF EXHALATION, AND TO PROVIDE AN ISOMETRIC, ISOTONIC OR ISOMETRIC-ISOTONIC TYPE OF EXERCISE FOR THE USER'S LUNGS
Medical, Beauty & Agricultural