# Relationship history for MSHA mine 1502423

Current hierarchy: **Cantrell Robert E → C C & R Coal Company Inc → No 1-A Mine (D)**

- 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:** Hall Coal Company → No 1-A Mine (D); 1950-01-01 to 1976-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Hall Leonard--Gary Thornsberry & George Smith → No 1-A Mine (D); 1950-01-01 to 1976-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Hall Leonard--Gary Thornsberry & George Smith → Hall Coal Company; 1950-01-01 to 1976-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Thornsberry Garry K & George M Smith → No 1-A Mine (D); 1975-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & T Coal Company → No 1-A Mine (D); 1976-08-19 to 1983-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Thornsberry Garry K & George M Smith → S & T Coal Company; 1976-08-19 to 1983-02-07; source msha-controller-operator-history
- **operator_operates_mine:** C C & R Coal Company Inc → No 1-A Mine (D); 1983-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cantrell Robert E → No 1-A Mine (D); 1983-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cantrell Robert E → C C & R Coal Company Inc; 1983-02-08 to current/open; source msha-controller-operator-history