1
Thompson Robert B, Thompson Donald O, Kraut Edgar A, Lim Teong C: Low velocity highly anisotropic elastic materials. North American Rockwell Corporation, October 17, 1972: US3699481 (3 worldwide citation)

This invention discloses a class of materials having a cellular structure which is suitable to slow the movement or velocity of elastic waves therein. An example of this class of materials is a cellular phenolic honeycomb polymer in which an elastic wave has a delay time of 0.6 milliseconds per inch ...


2
Staples Edward J, Lim Teong C: Senseurs de mesure a distance pour ondes acoustiques, Remote acoustic wave sensors. Rockwell International Corporation, RIDOUT & MAYBEE, November 2, 1982: CA1134938

ABSTRACT OF THE DISCLOSUREDisclosed is an acoustic wave sensor, including an acoustic waveoscillator having a resonant frequency which is modulated according to changesin a physical variable and a broadcast amplifier for directly transmitting themodulated frequency as a radio frequency signal. As a ...