# Relationship history for MSHA mine 2401362

Current hierarchy: **Smith Dale V → Union Reserve Coal Company Inc → Union Reserve Coal Company Inc**

- 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:** Bear Tooth Coal Company → Union Reserve Coal Company Inc; 1977-03-16 to 1985-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Joyce Western Corp → Union Reserve Coal Company Inc; 1977-03-16 to 1985-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Joyce Western Corp → Bear Tooth Coal Company; 1977-03-16 to 1985-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Union Reserve Coal Company Inc → Union Reserve Coal Company Inc; 1985-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Dale V → Union Reserve Coal Company Inc; 1985-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Dale V → Union Reserve Coal Company Inc; 1985-03-27 to current/open; source msha-controller-operator-history