Television Talk  Tihanyis American Patents  some of these inventions was patented in Germany  year earlier  httpwwwgooglecompatentsidlxmAAAAEBAJprintsecabstractzoomsourcegbsoverviewrcad  httpwwwgooglecompatentsidFDBAAAAEBAJprintsecabstractzoomsourcegbsoverviewrcad  And an  improvment httpwwwgooglecompatentsidphAAAAEBAJprintsecabstractzoomsourcegbsoverviewrcad  What are the differences between the patented devices and what was the essence and impact of these differences