Interesting Old Patents

A form of walkie talkie that is difficult to locatate from its radio profile that transmits by vibrating the building/ground

Patent Number: 5539705

Patent Date: July 23, 1996

Added to IOP: May 15, 2024, 12:34 a.m.

Method of using ultrasonic waves as an undetectable communications device, using something like a building as a carrier medium.

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