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- OPEL - also OPL
- One Pion Exchange
- ORU Protective Enclosure
- Office of Postsecondary Education
- Other Project Element
- Open-point expanding
- Orbiter Protection Enclosure
- Oregon, Pacific and Eastern Railway
- Operational Proficiency Examination
- Operating Plant Efficiency
- Operator product expansion
- Oregon Pacific and Eastern Railway Company
- Outboard Processing Environment
- Off Process Environment
- Office of Public Employment
- Other Plant Equipment
tác giả
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