# Relationship history for MSHA mine 1519913

Current hierarchy: **Kevin  Ratliff → LANDMARK MINING COMPANY, INC. → MINE 101**

- 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 101; 1978-09-01 to 2019-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Ratliff → MINE 101; 2019-06-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** LANDMARK MINING COMPANY, INC. → MINE 101; 2021-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Ratliff → LANDMARK MINING COMPANY, INC.; 2021-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas B  Ratliff → LANDMARK MINING COMPANY, INC.; 2021-12-26 to 2019-06-19; source msha-controller-operator-history