# Relationship history for MSHA mine 1509914

Current hierarchy: **Howell Corporation → Globe Coal Company Inc → No 2 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hogg Jim → No 2 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Globe Coal Company Inc → No 2 Surface; 1976-08-05 to 1977-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Hogg Jim → Globe Coal Company Inc; 1976-08-05 to 1977-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Globe Coal Company Inc → No 2 Surface; 1977-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howell Corporation → No 2 Surface; 1977-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howell Corporation → Globe Coal Company Inc; 1977-03-10 to current/open; source msha-controller-operator-history