What type of picture frames are the best?

The early history of motion pictures in the United States and Europe is marked by battles over patents of cameras. In 1886 Le Prince was granted an American dual-patent on a 16-lens device that combined a motion picture camera with a projector. A patent for a single-lens type (MkI) was refused because of an interfering patent, but a few years later the same patent was not opposed when Edison applied for one.