73018714
Apr 12, 1974
Nov 25, 1975
MAGNETIC TAPES, [ BOTH ] UNRECORDED [ AND RECORDED, ] FOR AUDIO TAPE RECORDERS; MAGNETIC TAPES, [ BOTH ] UNRECORDED [ AND RECORDED, ] FOR VIDEO TAPE RECORDERS; [ MAGNETIC TAPES, BOTH RECORDED AND UNRECORDED, FOR ELECTRONIC COMPUTERS ]
Electrical and Scientific Apparatus