This episode features a sound spectrograph which accidentally recorded an important conversation in an acoustics lab. The cops find somebody who can electronically decode the spectrograph chart. (Unnecessary level of sci-fi; in 1950 you could find an acoustics expert who could simply read the chart by eye. It was a common skill.)
And this one features a sort of tele-medicine. The main character is shot in the head, and the normal surgeons aren't able to remove the bullet safely. They locate the one surgeon who can do the procedure, and he instructs them by long-distance phone. The anatomy of the brain regions and incisions is accurate.
The current icon shows Polistra using a Personal Equation Machine.