# Relationship history for MSHA mine 1519908

Current hierarchy: **Kevin  Ratliff → Landmark Mining Company Inc → Mine 310**

- 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:** Thomas B  Ratliff → Mine 310; 1978-09-01 to 2019-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Ratliff → Mine 310; 2019-06-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Landmark Mining Company Inc → Mine 310; 2021-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Ratliff → Landmark Mining Company Inc; 2021-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas B  Ratliff → Landmark Mining Company Inc; 2021-10-27 to 2019-06-19; source msha-controller-operator-history