Does anyone know who wrote the Wikepedia article below? There are serious errors in the section called Hard Plastic Replaces Wax. It says that an Amberol is a PLASTIC cylinder, and that Edison started using 4-minute recordings only "around the same time" as the Amberol. I also found it interesting that Amberols have plaster cores. And that not all Amberols are 4-minute. http://en.wikipedia.org/wiki/Phonograph_cylinder Jim Nichol