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The history of electronics is a story of the twentieth century and three key components—the vacuum tube, the transistor, and the integrated circuit. In 1883, Thomas Alva Edison discovered that electrons will flow from one metal conductor to another through a vacuum. This discovery of conduction became known as the Edison effect. In 1904, John Fleming applied the Edison effect in inventing a two-element electron tube called a diode, and Lee De Forest followed in 1906 with the three-element tube, the triode. These vacuum tubes were the devices that made manipulation of electrical energy possible so it could be amplified and transmitted.The first applications of electron tubes were in radio communications. Guglielmo Marconi pioneered the development of the wireless telegraph in 1896 and long-distance radio communication in 1901.
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Flashlight (445) - Laser light (48) - Calculator (170) - Radio (226) - Electronic gift (48) - Flashing electronic gift (60) - Electronic fan (67) - Numeral gift (51) - calendar (85) - sound box (17) - theftproof tool (13) -

Aluminum alloy flashlight
ID: HP-019867
Flashlight (445)
Laser pointer
ID: HP-000968
Laser light (48)
The MP3 Calculator
ID: HP-020079
Calculator (170)
Radio
ID: HP-021214
Radio (226)
Clock
ID: HP-021108
Electronic gift (48)
Flashing electron
ID: HP-001614
Flashing electronic gift (60)
FAN
ID: HP-022429
Electronic fan (67)
digital photo frame
ID: HP-021587
Numeral gift (51)
calendar
ID: HP-021216
calendar (85)
Appeal miniature small sound box
ID: HP-021300
sound box (17)
Personal anti-theft device
ID: HP-001529
theftproof tool (13)

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