# Relationship history for MSHA mine 1512085

Current hierarchy: **Reading & Bates Corp → Golden Oak Mining Company Inc → No 4 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:** Paul J  Sturgill → No 4 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → No 4 Surface; 1979-10-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Sturgill → Golden Oak Mining Company Inc; 1979-10-01 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → No 4 Surface; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → No 4 Surface; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Golden Oak Mining Company Inc; 1981-01-01 to current/open; source msha-controller-operator-history