# Relationship history for MSHA mine 1512925

Current hierarchy: **Salyers Dallas → D & R Coal Company Inc → No 2 Mine**

- 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:** Fairmont Coal Corp → No 2 Mine; 1981-06-01 to 1982-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Mullins George → No 2 Mine; 1981-06-01 to 1982-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Mullins George → Fairmont Coal Corp; 1981-06-01 to 1982-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Forbes Mining Company Inc → No 2 Mine; 1982-12-20 to 1983-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Harris George F & Lonnie W Ayers → No 2 Mine; 1982-12-20 to 1983-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Harris George F & Lonnie W Ayers → Forbes Mining Company Inc; 1982-12-20 to 1983-01-09; source msha-controller-operator-history
- **operator_operates_mine:** D & R Coal Company Inc → No 2 Mine; 1983-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Dallas → No 2 Mine; 1983-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Dallas → D & R Coal Company Inc; 1983-01-10 to current/open; source msha-controller-operator-history