An aperture card for an AT&T engineering drawing, with the drawing itself on the frame of microfilm in the window. Its printed notice is a small piece of the Bell System breakup: under Judge Greene’s 1983 order, AT&T stopped using the “Bell” name and symbol on January 1, 1984, and the notice declares any reference to them “hereby deleted and expunged.” It’s a 3M Filmsort card, form KS-21478 L-2, dated February 1984. For the same card from before the breakup, see card 0003.
