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===How to tell===
* Many 1985-2007 tapes duplicated on BASF cassettes have dark or silver ink prototype codes. Usually, these codes included the tape nominal length, the shift digits, the print date and/or the print time.
** Only on tapes duplicated at either CBS/Fox or Technicolor.
** Some Memorex-manufactured tapes also had BASF codes. It is possible that somewhere down the line, Memorex licensed the tapes to BASF.
** For example, if the dark ink code reads "T-82 M3" on top and "012393 S 1223", or "012393 S", that means the cassette is a T-82 length and that the tape was manufactured on January 23, 1993. The time code would mean 12:23 PM, and S and M3 would be two of the shift digits.
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