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Audio cassette production and duplication

Calculator

*
  (more than 5 panels — upon request)

* Tape length is calculated as the length of the longer side increased by 30 sec. and multiplied by 2. Thus, if the longest side of the master record is 30 min., a C-61 cassette (61 min. total length = (30 min. + 30 sec)*2) is required.