| Both radiotelephony and radiotelegraphy were in wide use, but radiotelephony had not as yet proved reliable and satisfactory for tactical military communication. |
| While teaching, Thompson contributed to the development of electric dynamo machines and radiotelegraphy. |
| Most thunderstorm recorders register, by radiotelegraphy, the strays set up by lightning discharges. |
| Includes: radiotelephony, radiotelegraphy and radiotelex services. |
| Inauguration of the first branch of the imperial radiotelegraphy network, with the service between England and Canada. |
| Transmission apparatus for radiotelephony, radiotelegraphy, radio broadcasting and television. |
