# Relationship history for MSHA mine 4002219

Current hierarchy: **Moses Don R → Highcliff Coal Company → Red Ash 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Highcliff Coal Company → Red Ash Mine; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moses Don R → Red Ash Mine; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moses Don R → Highcliff Coal Company; 1977-04-01 to current/open; source msha-controller-operator-history