Radio

Heinrich Hertz demonstrates radio waves in the lab in the late 1880s, confirming Maxwell's equations. Guglielmo Marconi turns that into a signal that crosses the Atlantic in 1901. Alexander Popov and others send signals in the 1890s. The card uses 1901 because that is when wireless stops being a demonstration across a bay.

The contribution is a message with no wire. Ships can call. Later, broadcast radio puts one transmitter in front of millions of people. Television is radio plus a picture. A phone without a cord, a satellite, and Wi-Fi are the same physics with better coding.

Radio does not replace the telegraph at first. It covers places wires cannot go. The physics it depends on is the electromagnetic theory of the 1860s, not a new force discovered in 1901.

Reginald Fessenden transmits voice by radio in 1906. Marconi's 1901 signal is Morse, not sound.