# Relationship history for MSHA mine 1510773

Current hierarchy: **Ousley Gary Dale → Cobra Coals Inc → No 2 Mine**

- 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:** Mid Con Corp & Royalton Coal Corp Inc → No 2 Mine; 1975-09-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G C Coal Company → No 2 Mine; 1977-09-01 to 1978-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Childers George → No 2 Mine; 1977-09-01 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Childers George → G C Coal Company; 1977-09-01 to 1978-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Royalton Coal Corp Inc → No 2 Mine; 1978-10-11 to 1980-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Mid Con Corp & Royalton Coal Corp Inc → Royalton Coal Corp Inc; 1978-10-11 to 1980-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Cobra Coals Inc → No 2 Mine; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ousley Gary Dale Et Al → No 2 Mine; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ousley Gary Dale Et Al → Cobra Coals Inc; 1980-12-01 to current/open; source msha-controller-operator-history