Military ingenuity.
Fatz
R
R
Ohlin
D
D
D004430:Ear Protective Devices; D004867:Equipment Design; D006317:Hearing Loss, Noise-Induced / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008889:Military Personnel; D009784:Occupational Diseases / Q000209:etiology / Q000517:prevention & control*; D017751:Safety Management; D013018:Sound Spectrography