Some lovely oddities here

• "Roadway With Soundtrack and Method of Forming the Tracks", F. J. Dofsen, US Patent 2574090. 1951. grooved paving speaks warnings. a jewel.
• "Psychoacoustic Projector", A. E. Flanders, US Patent 3566347. 1971. psychoacoustic sound weapon localized by modulation scheme. see also "infra- and ultrasound.
• "Sonic Fish Bait", H. E. Stram, US Patent 3142927. 1964. sounding lure.
• "Fish Herder", J. L. Wyatt, US Patent 3177465. 1965. attracts fish with music.
• "Acoustical Testing Method and Apparatus", C. A. Heath, US Patent 3345861. 1967. a gem.testing telephone poles by hammering and listening.
• "Sonic Testing Device", D. R. Nichols, US Patent 3361225. 1968. similar to "stud finder".