# Relationship history for MSHA mine 3608570

Current hierarchy: **Thomas H  Loughry; John W  Loughry → T L H Coal Company → Smith Strip**

- 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 H  Loughry et al → Smith Strip; 1975-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T L H Coal Company → Smith Strip; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas H  Loughry et al → T L H Coal Company; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Loughry et al → T L H Coal Company; 1996-07-01 to current/open; source msha-controller-operator-history