Silent Sounds
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✎ Suggest a correctionIntroduces a new, portable device which extends man's hearing into the ultrasonic range normally heard only by certain animals.
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Sources
- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, creator, length, format, sound, description
- 16mm Filmography (legacy record) — catalog record
Original permalink · Record added 2023-02-27 04:06:24 · Suggest a correction