What kind of company takes out ads in daily newspapers attacking one of its own type of products? In the case of Panasonic, the answer is a company that has significant investments in a rival technology.Panasonic, the consumer electronics company owned by Matsushita Electric Industrial, is the world’s biggest seller of plasma TVs. And it has long extolled the benefits of that technology compared with L.C.D., another flat-panel TV product. At the same time, the company sells a full line of L.C.D. sets.   Read more....