Summary Technical Report of Division 6, NDRC. Volume 19. Underwater Sound Equipment 6. Countermeasures Open PDF Document Details Document Type Technical Report Publication Date Sep 30, 1946 Accession Number AD0221608 Tags Communities of Interest Energy and Power Technologies Ground and Sea Platforms Weapons Technologies DTIC Thesaurus Topics Acoustic Equipment Acoustic Properties Acoustics Chemistry Control Systems Electronic Components Energy Material Degradation Processes Materials Laboratories Materials Processing Materials Science Navy Piezoelectric Crystals Propulsion Systems Sonar Decoys Test And Evaluation Transducers