# Relationship history for MSHA mine 4405636

Current hierarchy: **Gibson James → Simplex Coal Corp → Mine 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:** Sonny J  Smith → Mine No 1; 1975-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple S Coal Company Inc → Mine No 1; 1981-04-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Sonny J  Smith → Triple S Coal Company Inc; 1981-04-01 to 1981-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Simplex Coal Corp → Mine No 1; 1981-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibson James → Mine No 1; 1981-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibson James → Simplex Coal Corp; 1981-06-17 to current/open; source msha-controller-operator-history