# Relationship history for MSHA mine 4607845

Current hierarchy: **Castle Rock Coal Corp → Harley Mining Inc → Mine No 3**

- 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

- **controller_controls_mine:** Castle Rock Coal Corp → Mine No 3; 1989-11-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harley Mining Inc → Mine No 3; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Castle Rock Coal Corp → Harley Mining Inc; 1990-02-01 to current/open; source msha-controller-operator-history