Transistor frequency meter.

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• National Defense Academyの論文

National Defense Academy | 論文

• The sound scattering cross section of a cylinder and a submarine model in water.
• Short-range deep-water transmission.
• The transmission of sound waves in shallow water.
• Refraction of sound by the sound channel in the ocean.
• The model experiments of the radar cross section of the aircraft by the ultrasonic wave in air.

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