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There are varying disputed claims about who invented radio, which in the beginning was called "wireless telegraphy". The key invention for the beginning of "wireless transmission of data using the entire frequency spectrum", known as the spark-gap transmitter, has been attributed to various men. Marconi equipped ships with lifesaving wireless communications and established the first transatlantic radio service. Tesla developed means to reliably produce radio frequency electrical currents, publicly demonstrated the principles of radio, and transmitted long distance signals. The apparatus that Tesla used contained all the elements that were incorporated into radio systems before the development of the "oscillation valve", the early vacuum tube. Besides radio transmission, Tesla was also the first to apply the mechanism of electrical conduction to wireless practices. Also, he initially used sensitive electromagnetic receivers,[7] that were unlike the less responsive coherers later used by Marconi and other early experimenters.
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Torch (534) Laser Lamp (50) Calculator (189) Radio (234) Electronic Gift (99) Flashing Electronic Gift (63) Promotional Fan (78) Digital Gift (57) Calendar (90) Sound Box (18) Theftproof Gear (13)

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radio
ID: HP-026239
Cola radio
ID: HP-023819
Purple lily Flashlight radio
ID: HP-023820
ruler egg radio
ID: HP-023821
clock brush pot radio
ID: HP-023824
night lamp radio
ID: HP-023825
Radio
ID: HP-024353
calendar radio
ID: HP-022745
radio
ID: HP-022355
Radio
ID: HP-021214
Folderd radio
ID: HP-001177
Colourful desktop radio
ID: HP-001178
Electronic radio
ID: HP-001179
Stand radio
ID: HP-001180
Cartoon radio
ID: HP-001181
Cartoon radio
ID: HP-001182
Radio
ID: HP-001183
Radio
ID: HP-001184
Cartoon radio
ID: HP-001185
Clock radio
ID: HP-001186

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