# Relationship history for MSHA mine 0301581

Current hierarchy: **Brown E Frank → B & M Coal Company Inc → Alix**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Brown E Frank Et Al → Alix; 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & M Coal Company Inc → Alix; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown E Frank Et Al → B & M Coal Company Inc; 1984-07-01 to current/open; source msha-controller-operator-history