# Relationship history for MSHA mine 4201615

Current hierarchy: **Saunders Kearl → Blain Saunders → Kearl Saunders**

- 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:** Blake Donald-Lloyd & John → Kearl Saunders; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blake Mining Company → Kearl Saunders; 1979-01-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Blake Donald-Lloyd & John → Blake Mining Company; 1979-01-01 to 1980-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Energy Inc → Kearl Saunders; 1980-10-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Miller Ted → Kearl Saunders; 1980-10-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Miller Ted → Mineral Energy Inc; 1980-10-01 to 1986-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Blain Saunders → Kearl Saunders; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Saunders Kearl → Kearl Saunders; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saunders Kearl → Blain Saunders; 1986-07-01 to current/open; source msha-controller-operator-history