# Relationship history for MSHA mine 4002266

Current hierarchy: **Katz Melvin--Robert Alexander & Gary Long → National Coal Resources Of Dayton → No 1 Surface**

- 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

- **controller_controls_mine:** Katz Melvin--Robert Alexander & Gary Long → No 1 Surface; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-County Mining Company → No 1 Surface; 1977-06-01 to 1977-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Maddaux Clyde → No 1 Surface; 1977-06-01 to 1977-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Maddaux Clyde → Tri-County Mining Company; 1977-06-01 to 1977-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Coalmation Inc → No 1 Surface; 1977-08-03 to 1977-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Miller Richard → No 1 Surface; 1977-08-03 to 1977-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Miller Richard → Coalmation Inc; 1977-08-03 to 1977-12-05; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Resources Of Dayton → No 1 Surface; 1977-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Katz Melvin--Robert Alexander & Gary Long → National Coal Resources Of Dayton; 1977-12-06 to current/open; source msha-controller-operator-history