# Relationship history for MSHA mine 1504121

Current hierarchy: **Sexton Willis & Earnest Cook → C & S Coal Company → 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:** Collins Burnett & Hubert Caudill → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & C Coal Company → No 2 Mine; 1971-07-01 to 1973-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Collins Burnett & Hubert Caudill → C & C Coal Company; 1971-07-01 to 1973-02-28; source msha-controller-operator-history
- **operator_operates_mine:** C & S Coal Company → No 2 Mine; 1973-03-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Sexton Willis & Earnest Cook → No 2 Mine; 1973-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Willis & Earnest Cook → C & S Coal Company; 1973-03-01 to 1973-12-31; source msha-controller-operator-history
- **operator_operates_mine:** C & C Coal Company → No 2 Mine; 1974-01-01 to 1974-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Collins Burnett & Hubert Caudill → C & C Coal Company; 1974-01-01 to 1974-03-31; source msha-controller-operator-history
- **operator_operates_mine:** C & S Coal Company → No 2 Mine; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Willis & Earnest Cook → C & S Coal Company; 1974-04-01 to current/open; source msha-controller-operator-history