# Relationship history for MSHA mine 4602403

Current hierarchy: **Pittsburgh & Redstone Fuel Company Inc → Pittsburgh & Redstone Fuel Company Inc → Sun Valley 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pittsburgh & Redstone Fuel Company Inc → Sun Valley Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pittsburgh & Redstone Fuel Company Inc → Sun Valley Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittsburgh & Redstone Fuel Company Inc → Pittsburgh & Redstone Fuel Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history