# Relationship history for MSHA mine 1509939

Current hierarchy: **Gleason E D → Seven Star Coal Company Inc → Seven Star No 1**

- 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:** Walsh Eugene & William J Morse → Seven Star No 1; 1974-11-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rough River Coal Company Inc → Seven Star No 1; 1976-08-18 to 1977-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Walsh Eugene & William J Morse → Rough River Coal Company Inc; 1976-08-18 to 1977-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Mining Company Inc → Seven Star No 1; 1977-06-02 to 1978-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Goodaker Garry → Seven Star No 1; 1977-06-02 to 1979-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Goodaker Garry → Cheyenne Mining Company Inc; 1977-06-02 to 1978-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Seven Star Coal Company Inc → Seven Star No 1; 1978-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gleason E D → Seven Star No 1; 1978-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gleason E D → Seven Star Coal Company Inc; 1978-04-20 to current/open; source msha-controller-operator-history