# Relationship history for MSHA mine 4603177

Current hierarchy: **Massey Energy Company → Alpine Development Company → Mine 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

- **operator_operates_mine:** Drexel Coal Company → Mine No 1; 1972-01-01 to 1972-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Drexel Coal Company → Mine No 1; 1972-01-01 to 1972-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Drexel Coal Company → Drexel Coal Company; 1972-01-01 to 1972-06-15; source msha-controller-operator-history
- **operator_operates_mine:** E & N Coal Company → Mine No 1; 1972-06-16 to 1975-05-09; source msha-controller-operator-history
- **controller_controls_mine:** E & N Coal Company → Mine No 1; 1972-06-16 to 1975-05-09; source msha-controller-operator-history
- **controller_controls_operator:** E & N Coal Company → E & N Coal Company; 1972-06-16 to 1975-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Charbon → Mine No 1; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** No 10 Coal Mine Inc → Mine No 1; 1975-05-10 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → No 10 Coal Mine Inc; 1975-05-10 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 1; 1985-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Development Company → Mine No 1; 1985-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Alpine Development Company; 1985-09-07 to current/open; source msha-controller-operator-history