# Relationship history for MSHA mine 1512831

Current hierarchy: **Lester Ronnie → Advance Coal Company Inc → No 1**

- 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:** Curtis  Francis → No 1; 1971-11-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Hill Coal Company → No 1; 1981-04-01 to 1984-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Francis → Big Hill Coal Company; 1981-04-01 to 1984-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Lester Ronnie → No 1; 1983-09-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shanco Energy Corp → No 1; 1984-02-27 to 1985-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Thomas J Shannon → No 1; 1984-02-27 to 1985-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Thomas J Shannon → Shanco Energy Corp; 1984-02-27 to 1985-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Advance Coal Company Inc → No 1; 1985-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Ronnie → Advance Coal Company Inc; 1985-01-23 to current/open; source msha-controller-operator-history