I want to know the answer to the following question:
What was the first commercial uses of LEDs?
All the background I'm provided with is that "The first commercial LEDs were commonly used as replacements for incandescent and neon indicator lamps, and in seven-segment displays, first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as TVs, radios, telephones, calculators, as well as watches (see list of signal uses).". Is that enough to answer the question?