# Relationship history for MSHA mine 3602752

Current hierarchy: **Minns Thomas J → Minns Coal Company → Minns Strip No 138-8**

- 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

- **operator_operates_mine:** Minns Coal Company → Minns Strip No 138-8; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Minns Thomas J → Minns Strip No 138-8; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minns Thomas J → Minns Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history