# Relationship history for MSHA mine 0900862

Current hierarchy: **Southeastern Metallurgical Coal Company Inc → Southeastern Metallurgical Coal Company Inc → Adkins Strip**

- 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:** Leatherman Floyd → Adkins Strip; 1976-05-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leatherman Inc → Adkins Strip; 1977-01-01 to 1977-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Leatherman Floyd → Leatherman Inc; 1977-01-01 to 1977-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Southeastern Metallurgical Coal Company Inc → Adkins Strip; 1977-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Southeastern Metallurgical Coal Company Inc → Adkins Strip; 1977-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Southeastern Metallurgical Coal Company Inc → Southeastern Metallurgical Coal Company Inc; 1977-03-19 to current/open; source msha-controller-operator-history