# Relationship history for MSHA mine 3607325

Current hierarchy: **Walling Richard → Exact Mining Inc → Magic 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:** Exact Mining Inc → Magic Mine; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walling Richard → Magic Mine; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walling Richard → Exact Mining Inc; 1982-06-01 to current/open; source msha-controller-operator-history