# Relationship history for MSHA mine 1513437

Current hierarchy: **Thomas C M → Kentuckiana Land Company Inc → Mine No 1**

- 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

- **operator_operates_mine:** Darby Ruth Coal Company Inc → Mine No 1; 1982-04-01 to 1984-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Ruth Darby → Mine No 1; 1982-04-01 to 1984-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Ruth Darby → Darby Ruth Coal Company Inc; 1982-04-01 to 1984-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Kentuckiana Land Company Inc → Mine No 1; 1984-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas C M → Mine No 1; 1984-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas C M → Kentuckiana Land Company Inc; 1984-05-31 to current/open; source msha-controller-operator-history