| item | description | category | filter | more on... |
| HFO | Haas Factory Outlet | Business/Firms |
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| HFO | Hafnium Oxide | Edu./Chemistry |
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| HFO | Harrisburg Field Office | Other/States-Local |
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| HFO | Heavy Fuel Oil | Governmental/Suppliers |
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| HFO | High Frequency oscillator | Governmental/NASA |
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