Mechanical Television Daven DisksThis is a T-468 "Tri Standard" disk. It has three sets of holes: 24, 36 and 48 lines. T-24. 24 line disk. Abouty 14 inches in diameter Donated by Mark Fliegel From Walter Rowan 1929 catalog Invisible text to format smartphones. xxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx |