| item | description | category | filter | more on... |
| OPU | Belimo, Papua New Guinea | Regional/Airport Codes |
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| OPU | Optical Pick-up Unit | Edu./Electronics |
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| OPU | Oregon Parents United | Non-Profit Organizations |
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| OPU | Ovum Pick-Up | Medical/Veterinary |
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| OPU | Owatonna Public Utilities | Business/Firms |
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