# Relationship history for MSHA mine 1502374

Current hierarchy: **Cain Herbert Jr → Cain Coal Company → No 1 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

- **operator_operates_mine:** Gwendon Coals Inc → No 1 Mine; 1950-01-01 to 1975-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Combs Charles E → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Combs Charles E → Gwendon Coals Inc; 1950-01-01 to 1975-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Cain Coal Company → No 1 Mine; 1975-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cain Herbert Jr → No 1 Mine; 1975-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cain Herbert Jr → Cain Coal Company; 1975-01-02 to current/open; source msha-controller-operator-history