| item | description | category | filter | more on... |
| RRO | Rate and Route Operator (telecommunications) | Uncategorized |
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| RRO | Regional Reliability Organization | Business/General |
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| RRO | Regional Reliability Organization | Governmental/NASA |
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| RRO | Registered Roof Observer | Governmental/US Gov. |
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| RRO | Reproduction Rights Organization | Governmental/US Gov. |
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| RRO | Resource Recovery Office | Governmental/US Gov. |
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| RRO | Resource Recovery Office | Governmental/Military |
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| RRO | Revised Regulations of Ontario | Other/Canada Provinces |
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| RRO | Rocky Road Outfitters | Business/Firms |
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| RRO | Sorrento, Italy | Regional/Airport Codes |
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