# Relationship history for MSHA mine 4002469

Current hierarchy: **National Coal Corporation → National Coal Corporation → Mine No. 8**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Scott Coal Corp → Mine No. 8; 1978-08-01 to 1986-03-02; source msha-controller-operator-history
- **controller_controls_mine:** W T  Strunk et al → Mine No. 8; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W T  Strunk et al → Scott Coal Corp; 1978-08-01 to 1986-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Scott Coal Company Inc → Mine No. 8; 1986-03-03 to 1997-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → Mine No. 8; 1986-03-03 to 1997-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Scott Coal Company Inc; 1986-03-03 to 1997-08-26; source msha-controller-operator-history
- **operator_operates_mine:** U S Coal Inc → Mine No. 8; 1997-08-27 to 2004-04-16; source msha-controller-operator-history
- **controller_controls_mine:** William M  Bale → Mine No. 8; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William M  Bale → U S Coal Inc; 2001-04-01 to 2004-04-16; source msha-controller-operator-history
- **controller_controls_mine:** National Coal Corporation → Mine No. 8; 2003-05-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Corporation → Mine No. 8; 2004-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Coal Corporation → National Coal Corporation; 2004-04-17 to current/open; source msha-controller-operator-history