# Relationship history for MSHA mine 4608476

Current hierarchy: **Horizon Natural Resources Incorporated → C C Coal Company → Skitter Creek Mine No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Carl F  Frischkorn → Skitter Creek Mine No 1; 1982-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Battle Ridge Companies → Skitter Creek Mine No 1; 1995-03-01 to 1998-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Carl F  Frischkorn → Battle Ridge Companies; 1995-03-01 to 1998-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Skitter Creek Mine No 1; 1998-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C C Coal Company → Skitter Creek Mine No 1; 1998-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → C C Coal Company; 1998-08-21 to current/open; source msha-controller-operator-history