# Relationship history for MSHA mine 4406210

Current hierarchy: **Alpha Natural Resources, Inc. → Knox Creek Coal Corp → Comanche No 9**

- 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:** Roberts Kenes P Jr & Sr → Comanche No 9; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Ralph → Comanche No 9; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double A Coal Company Inc → Comanche No 9; 1985-05-01 to 1988-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Ashby James M Et Al → Comanche No 9; 1985-05-01 to 1988-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Ashby James M Et Al → Double A Coal Company Inc; 1985-05-01 to 1988-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Coal Company → Comanche No 9; 1988-02-08 to 1993-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Kenes P Jr & Sr → Eastern Coal Company; 1988-02-08 to 1993-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Comanche Coal Corp → Comanche No 9; 1993-07-21 to 1999-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Ralph → Comanche Coal Corp; 1993-07-21 to 1999-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Comanche No 9; 1997-08-26 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knox Creek Coal Corp → Comanche No 9; 1999-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Knox Creek Coal Corp; 1999-03-02 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Comanche No 9; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Knox Creek Coal Corp; 2011-06-01 to current/open; source msha-controller-operator-history