William D. Bridson and Dmitry Gorelik, Ph.D., will head Navitar Inc.'s new research and development team, focusing on new products for the machine vision and visual presentation industries. Navitar is based in Rochester, N.Y.. . .L-3 Communications announced it will invest a 20 percent equity position in Millivision, an Amherst, Mass.-based developer of millimeter wave imaging technology and millimeter wave cameras.. . . Fischer Imaging Corp. has created a new Radiology, Electrophysiology, and Surgery Div. to support and develop its digital mammography and breast cancer screening/diagnosis products.