# Relationship history for MSHA mine 4602349

Current hierarchy: **Coal Arbed → Red Ash Sales Company Inc → Preparation 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:** Red Ash Sales & Processing Company → Preparation Plant; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Hassel → Preparation Plant; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Hassel → Red Ash Sales & Processing Company; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **operator_operates_mine:** Red Ash Sales Company Inc → Preparation Plant; 1975-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coal Arbed → Preparation Plant; 1975-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Arbed → Red Ash Sales Company Inc; 1975-12-18 to current/open; source msha-controller-operator-history