| item | description | category | filter | more on... |
| HEM | Heavy Equipment Maintenance | Governmental/Military |
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| HEM | Historical Electronics Museum | Other/Museums |
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| HEM | Hitchhike Experiment Module | Governmental/NASA |
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| HEM | Hydrogenic Effective Mass | Edu./Electronics |
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| HEM | Hydrogenic Effective Mass | Uncategorized |
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