# Relationship history for MSHA mine 4604555

Current hierarchy: **Haught Warren R → Haught Coal Corp → Haught Coal No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Haught Coal Corp → Haught Coal No 1 Strip; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haught Warren R → Haught Coal No 1 Strip; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haught Warren R → Haught Coal Corp; 1975-04-01 to current/open; source msha-controller-operator-history