Acronym on Tape Reel Sheet

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I picked up a few reel to reel tapes that appear to be recordings of shows from a radio station. They are basically a listing of what is on the tape, speed, mono, time, etc.

The one quesion I have is there are two entry boxes on them labeled R.O.D. and P.B.O. Only the R.O.D. boxes have anything entered, they have values of 1 on one sheet and 2 on another.
Would anyone have an idea as to what they mean?

I am looking to recreate the form in MS Word, and I am wondering if there would be any benifit to include them. I probably will, just to maintain authenticity. For what it is worth.

Thanks,
jay
 
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