# Relationship history for MSHA mine 1516183

Current hierarchy: **Stanley W Osborne → Sister Bear Mining Inc → Mine #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:** Thomas B  Ratliff → Mine #9; 1978-09-01 to 2019-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Benny → Mine #9; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & T Kentucky Coal Company Inc → Mine #9; 1987-10-01 to 1990-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Benny → T & T Kentucky Coal Company Inc; 1987-10-01 to 1990-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Landmark Mining Company Inc → Mine #9; 1990-06-07 to 2001-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Thomas B  Ratliff → Landmark Mining Company Inc; 1990-06-07 to 2001-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Stanley W Osborne → Mine #9; 1996-09-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sister Bear Mining Inc → Mine #9; 2001-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley W Osborne → Sister Bear Mining Inc; 2001-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Ratliff → Mine #9; 2019-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Ratliff → Landmark Mining Company Inc; 2019-06-20 to 2001-04-05; source msha-controller-operator-history