# Relationship history for MSHA mine 0202525

Current hierarchy: **Westerbur Clarence D → C-West Company → C-West Company Marble Quarry**

- 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:** C-West Company → C-West Company Marble Quarry; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westerbur Clarence D → C-West Company Marble Quarry; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westerbur Clarence D → C-West Company; 1990-06-01 to current/open; source msha-controller-operator-history