# Relationship history for MSHA mine 1506254

Current hierarchy: **Coats Parker → Monitor Coal Company → 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:** United Mining Company Inc → No 1 Surface Mine; 1950-01-01 to 1974-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Davis James O & Louis Pineur → No 1 Surface Mine; 1950-01-01 to 1974-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Davis James O & Louis Pineur → United Mining Company Inc; 1950-01-01 to 1974-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Bizzack John → No 1 Surface Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bizwil Inc → No 1 Surface Mine; 1974-06-02 to 1974-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Bizzack John → Bizwil Inc; 1974-06-02 to 1974-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Monitor Coal Company → No 1 Surface Mine; 1974-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coats Parker → No 1 Surface Mine; 1974-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coats Parker → Monitor Coal Company; 1974-08-02 to current/open; source msha-controller-operator-history