# Relationship history for MSHA mine 4405568

Current hierarchy: **Blankenship Ralph → Comanche Coal Corp → Mine No 6**

- 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:** Mc Clanahan Donald Keith → Mine No 6; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Ralph → Mine No 6; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lynn Coal Company Inc → Mine No 6; 1980-12-01 to 1985-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clanahan Donald Keith → Lynn Coal Company Inc; 1980-12-01 to 1985-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Coal Corp → Mine No 6; 1985-12-11 to 1988-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Patrick R Et Al → Mine No 6; 1985-12-11 to 1988-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Patrick R Et Al → Liberty Coal Corp; 1985-12-11 to 1988-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Nita Coal Company Inc → Mine No 6; 1988-03-29 to 1988-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Looney Jerry → Mine No 6; 1988-03-29 to 1988-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Looney Jerry → Nita Coal Company Inc; 1988-03-29 to 1988-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Reco Mining Inc → Mine No 6; 1988-06-07 to 1990-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Stacy → Mine No 6; 1988-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Stacy → Reco Mining Inc; 1988-06-07 to 1990-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Comanche Coal Corp → Mine No 6; 1990-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Ralph → Comanche Coal Corp; 1990-03-14 to current/open; source msha-controller-operator-history