# Relationship history for MSHA mine 1507228

Current hierarchy: **Gibbs B E → Benco Coal Company Inc → No 1 Surface 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C & J Coal Company Inc → No 1 Surface Mine; 1974-07-09 to 1974-12-02; source msha-controller-operator-history
- **controller_controls_mine:** C & J Coal Company Inc → No 1 Surface Mine; 1974-07-09 to 1974-12-02; source msha-controller-operator-history
- **controller_controls_operator:** C & J Coal Company Inc → C & J Coal Company Inc; 1974-07-09 to 1974-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Benco Coal Company Inc → No 1 Surface Mine; 1974-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibbs B E → No 1 Surface Mine; 1974-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibbs B E → Benco Coal Company Inc; 1974-12-03 to current/open; source msha-controller-operator-history