| item | description | category | filter | more on... |
| EFR | Eit Fits Realtime | IT/General |
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| EFR | Electronic Flight Rules | Other/Transportation |
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| EFR | Electronic Fuel Regulator | Other/Transportation |
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| EFR | Emergency Feature Request | IT/General |
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| EFR | Enhanced Failure Rate | Edu./Electronics |
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| EFR | Enhanced Full Rate | Business/General |
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| EFR | Essential Fault Reduction | Edu./Mathematics |
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| EFR | Extended Focus Range | Misc/Photography |
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| EFR | External Finance Relations | Business/General |
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