# Relationship history for MSHA mine 4605427

Current hierarchy: **Chafin Clyde → Dry Gulch Coal Company → Rex Mine**

- 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:** Lee Ann Coal Company Inc → Rex Mine; 1977-02-01 to 1984-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Mc Coy John P Et Al → Rex Mine; 1977-02-01 to 1984-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Coy John P Et Al → Lee Ann Coal Company Inc; 1977-02-01 to 1984-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Dry Gulch Coal Company → Rex Mine; 1984-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chafin Clyde → Rex Mine; 1984-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chafin Clyde → Dry Gulch Coal Company; 1984-08-31 to current/open; source msha-controller-operator-history