# Relationship history for MSHA mine 4003109

Current hierarchy: **National Coal Corporation → National Coal Corporation → 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:** Dyer Steve → Mine No 1; 1997-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reatta Mining → Mine No 1; 1997-05-01 to 2003-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Dyer Steve → Reatta Mining; 1997-05-01 to 2003-05-26; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Corporation → Mine No 1; 2003-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** National Coal Corporation → Mine No 1; 2003-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Coal Corporation → National Coal Corporation; 2003-05-27 to current/open; source msha-controller-operator-history