73838045
Nov 6, 1989
Apr 30, 1991
TEACHING APPARATUS AND INSTRUMENTS, NAMELY OVERHEAD PROJECTORS, APPARATUS FOR RECORDING TRANSMISSION OR REPRODUCTION OF SOUND OR IMAGES, NAMELY OVERHEAD PROJECTORS; AND MAGNETIC DATA CARRIERS, NAMELY BLANK MAGNETIC CARRIERS IN THE FORM OF DISKS AND TAPE, AND DATA PROCESSING APPARATUS AND COMPUTERS
Electrical and Scientific Apparatus