What was the first school of thought based on?, Two distinct schools of thought in technology, Paul Nipkow's rotating disks., What system did the rotating disks support?, A mechanical television system., An electronic television system., 4. What was the second school of thought based on?, An electronic television system., Paul Nipkow's rotating disks., What did the electronic television system use?, A cathode-ray tube., Campbell-Swinton and Rosing., Who developed the cathode-ray tube independently?, An electronic television system., Campbell-Swinton and Rosing.

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