# Relationship history for MSHA mine 4606221

Current hierarchy: **Ruth  Prater → Coal Enterprises Inc → Refuse Dump Reclamation**

- 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

- **controller_controls_mine:** Ruth  Prater  et al → Refuse Dump Reclamation; 1978-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Enterprises Inc → Refuse Dump Reclamation; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruth  Prater  et al → Coal Enterprises Inc; 1980-07-01 to current/open; source msha-controller-operator-history