I want to know the answer to the following question:
What was the name of the discs Edison introduced in 1909?
All the background I'm provided with is that "In an attempt to head off the disc advantage, Edison introduced the Amberol cylinder in 1909, with a maximum playing time of 4½ minutes (at 160 rpm), which in turn were superseded by Blue Amberol Records, which had a playing surface made of celluloid, a plastic, which was far less fragile.". Is that enough to answer the question?