# Relationship history for MSHA mine 1507966

Current hierarchy: **Hogg Jim → Bright 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: 2026-10-13T11:19:05.459773+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:** Lake Coal Company Inc → No 2 Surface; 1975-01-01 to 1977-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Hogg Jim → Lake Coal Company Inc; 1975-01-01 to 1977-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Howell Corporation → No 2 Surface; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lake Coal Company Inc → No 2 Surface; 1977-03-14 to 1980-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Howell Corporation → Lake Coal Company Inc; 1977-03-14 to 1980-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Hogg Jim → No 2 Surface; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bright Coal Company Inc → No 2 Surface; 1980-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hogg Jim → Bright Coal Company Inc; 1980-04-18 to current/open; source msha-controller-operator-history