Superior Title: Economist. 8/21/2021, Vol. 440 Issue 9259, p66-66. 2/3p.
Subject Terms: SIGNALS & signaling, BRAIN
Superior Title: Economist. 3/27/1993, Vol. 326 Issue 7804, p85-86. 2p.
Subject Terms: *TELECOMMUNICATION systems, *TELECOMMUNICATION satellites, ROBOTIC pets, OCEAN engineering, SCIENTISTS, SIGNALS & signaling
Superior Title: Economist. 1/19/2008, Vol. 386 Issue 8563, p88-88. 1/2p. 1 Color Photograph.
Subject Terms: *UNDERWATER acoustics, *ECHO, *SOUND wave scattering, *TRANSMISSION of sound, *SONAR, *SUBMARINE signals & signaling