| item | description | category | filter | more on... |
| O&M | Operation and Maintenance | Governmental/NASA |
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| O&M | Operations and Maintenance | Uncategorized |
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| O&M | Operations and Maintenance | Governmental/Military |
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| O&M | Operations and Maintenance | Other/Transportation |
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| O&M | Organizaç?o e Métodos | Business/General |
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| O&M | Original Equipment Manufacturer | Misc/Chess |
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