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I do not think we protectionist is a problem because the market for radio receivers, and various household appliances was also open to American equipment. Here in Europe evaluated the NTSC system that had many flaws and imperfections decided to improve it, opening a technological war between France and Germany. In fact, the PAL and SECAM systems are derived directly from NTSC but not identical because of patents. In Italy in the'70s Indesit ISA developed the system significantly improved at all another, but out of time and impossible to enforce.
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