I found these the other day and rescued them. I haven't checked the part numbers but I think they're for a Protocall Analyzer. Both appear to be in great shape. (1) HP 4955A Data Code Cartridge 04955-16003 (2) HP 18143A Training Tape 18143-16001. Anybody want them? Prefereable someone that can duplicate them and make them available to others. Joe PS these are the later style DC-100 tapes with the metal backplate and drive wheel. The drive band appears to be ok.