Which company developed the electronic scanning system that rivaled Baird?
Answer
EMI
EMI, which had merged with Marconi, developed the electronic scanning system that ultimately proved more viable than mechanical television. Their system operated at a much higher resolution of 405-lines and provided greater mobility by eliminating the need for the cumbersome developer tanks, hoses, and cables required by the mechanical approach. The BBC eventually trialed both systems before opting for the cleaner, more efficient electronic technology.

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