# Relationship history for MSHA mine 1501982

Current hierarchy: **Thomas E  Green → Green Coal Company Inc → K-9**

- 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:** Green Coal Company Inc → K-9; 1950-01-01 to 1993-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Green → K-9; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Green → Green Coal Company Inc; 1950-01-01 to 1993-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Green Coal Company Inc → K-9; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Petro Union Inc → K-9; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Petro Union Inc → Green Coal Company Inc; 1993-04-10 to 1994-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Green Coal Company Inc → K-9; 1994-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Green → Green Coal Company Inc; 1994-08-11 to current/open; source msha-controller-operator-history