Basics: Acquisition of Copyright The laws of almost all countries provide that protection is independent of any formalities. Copyright protection then starts as soon as the work is created.

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Vacuum tube The first half of the 20th century was the era of the vacuum tube in electronics. This variety of electron tube permitted the development of radio broadcasting, long-distance telephony, television, and the first electronic digital computers. These early electronic computers were, in fact, the largest vacuum-tube systems ever built. Perhaps the best-known representative is the ENIAC (Electronic Numerical Integrator and Computer, completed in 1946).

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