# Relationship history for MSHA mine 0503461

Current hierarchy: **Mehl Robert L → Resources International Corp → Ramey 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:** Resources International Corp → Ramey Mine; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mehl Robert L → Ramey Mine; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mehl Robert L → Resources International Corp; 1979-06-01 to current/open; source msha-controller-operator-history