| item | description | category | filter | more on... |
| USO | Ultra Stable Oscillator | Governmental/NASA |
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| USO | Unconfirmed Stories Organization | Governmental/US Gov. |
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| USO | Unidentified Submarine Object | Governmental/Military |
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| USO | Unidentified Superconducting Object | Edu./Electronics |
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| USO | United Service Organization | Governmental/Military |
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| USO | United Service Organizations | Non-Profit Organizations |
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| USO | United Services Organization | Non-Profit Organizations |
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| USO | Universal Service Order | Uncategorized |
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| USO | Universal Social Obligation | Uncategorized |
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| USO | Unix Software Organization | Uncategorized |
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