# Relationship history for MSHA mine 1510355

Current hierarchy: **Salyers Gene & William Stiltner → Thermo Coal Corp → No 1-B 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:** Big Ridge Coal Company → No 1-B Mine; 1977-05-01 to 1982-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Lon & Clifford → No 1-B Mine; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Lon & Clifford → Big Ridge Coal Company; 1977-05-01 to 1982-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Carter William B & David → No 1-B Mine; 1980-04-14 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Gene & William Stiltner → No 1-B Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alma Coal Corp → No 1-B Mine; 1982-09-22 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Carter William B & David → Alma Coal Corp; 1982-09-22 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Infinity Coal Corp → No 1-B Mine; 1983-03-17 to 1986-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Alma Coal Corp → No 1-B Mine; 1983-03-21 to 1984-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Infinity Coal Corp → Alma Coal Corp; 1983-03-21 to 1984-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Thermo Coal Corp → No 1-B Mine; 1984-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Gene & William Stiltner → Thermo Coal Corp; 1984-02-16 to current/open; source msha-controller-operator-history