# Relationship history for MSHA mine 4606073

Current hierarchy: **White Harry K → Opal Coal Company → Opal #1 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:** Opal Coal Company → Opal #1 Mine; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Harry K → Opal #1 Mine; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Harry K → Opal Coal Company; 1979-10-01 to current/open; source msha-controller-operator-history