Original U.S. WWII Era Artillery M.S.A. Ear Defenders
Can't say if they were common but they had them
The military led the charge in developing hearing protection, notably with the Mallock-Armstrong earplugs used in WWI and the V-51R earplugs used in WWII. Improvements in comfort were introduced with the development of glass-down plugs in the late 1950s and foam earplugs in the 1970s.1
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