# Relationship history for MSHA mine 3606865

Current hierarchy: **Slusser Earl → Black Power Coal Company Inc → Mary D East #1**

- 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:** Warren Troup Coal Company → Mary D East #1; 1979-08-01 to 1982-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Troup Warren C Et Al → Mary D East #1; 1979-08-01 to 1982-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Troup Warren C Et Al → Warren Troup Coal Company; 1979-08-01 to 1982-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Black Power Coal Company Inc → Mary D East #1; 1982-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Slusser Earl → Mary D East #1; 1982-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Slusser Earl → Black Power Coal Company Inc; 1982-02-10 to current/open; source msha-controller-operator-history