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Start Over Subjects Ear Protective Devices ✖Remove constraint Subjects: Ear Protective Devices Subjects World War II ✖Remove constraint Subjects: World War II Titles Report on project no. 12 -- test of accousti-guard (ear protective device) ✖Remove constraint Titles: Report on project no. 12 -- test of accousti-guard (ear protective device) Copyright Public domain ✖Remove constraint Copyright: Public domain

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  • Report on project no. 12 -- test of accousti-guard (ear protective device)1