Computer stamps - year 1973 - postage stamps on computer science

postage stamps year 1973

	ID#521 Country Colombia Year 1973 Issue National control 1v Subject magnetic tape Tag magnetic tape
	ID#462 Country Poland Year 1973 Issue Space observatory Copernicus 1v Subject magnetic ink characters Tag characters-MICR
	ID#463 Country Poland Year 1973 Issue Space astronauts 1v Subject magnetic ink characters Tag characters-MICR
	ID#535 Country USA Year 1973 Issue Progress in electronics 4v Subject circuits Tag printed circuit
	ID#245 Country USSR Year 1973 Issue Cosmonauts day 3v Subject terminal Tag terminal
	ID#246 Country USSR Year 1973 Issue Cosmonauts day 3v Subject terminal Tag terminal