# Relationship history for MSHA mine 0301521

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

- 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

- **operator_operates_mine:** Leland Energy Corp → Black Reclamation; 1981-11-01 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Floyd L  Ogle → Black Reclamation; 1981-11-01 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Floyd L  Ogle → Leland Energy Corp; 1981-11-01 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Brown E Frank Et Al → Black Reclamation; 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & M Coal Company Inc → Black Reclamation; 1984-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown E Frank Et Al → B & M Coal Company Inc; 1984-07-23 to current/open; source msha-controller-operator-history