Cryogenics Fluids Production · Merged into 545X0, effective April 1, 1980
The report identifies 545X0 as the present merged ladder; continuing participant 545X0 is excluded as a self-successor predecessor. Verified source wording: “The survey was requested to evaluate the effect of the April 1980 merger of the Refrigeration and Air Conditioning career ladder (AFS 545X0) and the Cryogenics Fluids Production career ladder (AFS 544X0).”
Sources
- Refrigeration and Cryogenics Career Ladder, AFSc 54530, 54550, and 54570. (Internet Archive full-text OCR around char offset 8,423; governing lineage context verified)