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Invention: Proving the existence of radio waves | Contribution to Radio: Demonstrated that electromagnetic waves could be transmitted and received, confirming James Clerk Maxwell's theories.

Invention: Telegraphone (the magnetic wire recorder) | Contribution to Radio: Developed an early form of magnetic audio recording, which was a significant step towards modern-day audio recording and playback for broadcasting.

Invention: Cathode Ray Tube | Contribution to Radio: His invention was crucial for the later development of television and radio technology.

Invention: Branly coherer | Contribution to Radio: Created a radio wave detector which was an important component in early radio telegraphy systems.

Invention: Radio Telegraphy | Contribution to Radio: Developed the first successful long-distance wireless telegraph and broadcast the first transatlantic radio signal.

Invention: Magnetic tape recording | Contribution to Radio: His invention allowed for the recording and playback of radio programs, profoundly impacting broadcast radio.

Invention: Audion (triode vacuum tube) | Contribution to Radio: His invention improved signal reception and made long-distance radio broadcasting possible.

Invention: Coherer, Tuneable Radio Frequency circuits | Contribution to Radio: Improved the coherer detector for wireless telegraphy and contributed to the development of tuneable radio.

Invention: Lightning detector, Radio receiver | Contribution to Radio: Built one of the first radio receivers, which was capable of detecting lightning strikes and eventually, transmission of an unmodulated sequence over a short distance.

Invention: Pantelegraph (a precursor to the fax machine) | Contribution to Radio: Although not directly related to radio transmissions, his work on electrical transmission of images laid foundational knowledge for future electronic communication.

Invention: Radio receiver | Contribution to Radio: Improved the radio receiver into a practical device and demonstrated its ability to receive signals; this led to the inception of practical radio communication.

Invention: Theory of Electromagnetic Radiation | Contribution to Radio: Formulated the equations of electromagnetic theory, which predicted the existence of radio waves.

Invention: Early coherer-based wireless telegraph | Contribution to Radio: Was one of the first German wireless pioneers and worked on the precepts of radiotelegraphy.

Invention: Frequency Modulation (FM) | Contribution to Radio: Invented frequency modulation for stronger radio signal broadcasting with less static interference than AM.

Invention: Tesla coil, Alternating Current (AC) | Contribution to Radio: Pioneered the use of alternating current for power transmission, contributing to radio technology's underlying principles.

Invention: Continuous-wave and amplitude-modulated (AM) radio transmissions | Contribution to Radio: Successfully transmitted the first voice and music broadcast over long distances.

Invention: Various improvements in wireless telegraphy | Contribution to Radio: Owns multiple patents that contributed to stabilizing and tuning wireless radio frequency apparatus.