# Relationship history for MSHA mine 4607007

Current hierarchy: **Castle Ralph Jr → Free Eagle Coal Company Inc → Usa #1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Free Eagle Coal Company Inc → Usa #1 Mine; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Castle Ralph Jr → Usa #1 Mine; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Castle Ralph Jr → Free Eagle Coal Company Inc; 1985-09-01 to current/open; source msha-controller-operator-history