# Relationship history for MSHA mine 1511949

Current hierarchy: **Reading & Bates Corp → Golden Oak Mining Company Inc → No 1 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

- **operator_operates_mine:** Big Elk Creek Coal Company Inc → No 1 Surface; 1979-05-01 to 1981-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Hylton Oliver W → No 1 Surface; 1979-05-01 to 1983-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Oliver W → Big Elk Creek Coal Company Inc; 1979-05-01 to 1981-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → No 1 Surface; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → No 1 Surface; 1981-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Golden Oak Mining Company Inc; 1981-10-13 to current/open; source msha-controller-operator-history