# Relationship history for MSHA mine 1506838

Current hierarchy: **Branham Jack Jr → Columbia Coal Company Inc → No G-31 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:** Ousley Cecil D → No G-31 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Pen Coals Inc → No G-31 Mine; 1973-01-01 to 1974-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Ousley Cecil D → Wolf Pen Coals Inc; 1973-01-01 to 1974-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Coal Company Inc → No G-31 Mine; 1974-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Branham Jack Jr → No G-31 Mine; 1974-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Branham Jack Jr → Columbia Coal Company Inc; 1974-10-08 to current/open; source msha-controller-operator-history