# Relationship history for MSHA mine 3304614

Current hierarchy: **Robert E  Murray → West Virginia Resources, Inc. → Prep Plant**

- 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:** West Virginia Resources, Inc. → Prep Plant; 2008-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Prep Plant; 2008-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → West Virginia Resources, Inc.; 2008-10-28 to current/open; source msha-controller-operator-history