# Relationship history for MSHA mine 2000286

Current hierarchy: **Holzhei Kenneth R & Robin → Au Gres Rock → Van Deusen 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Van Deusen Stone Company → Van Deusen Quarry; 1950-01-01 to 1984-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Van Deusen Shirley → Van Deusen Quarry; 1950-01-01 to 1984-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Van Deusen Shirley → Van Deusen Stone Company; 1950-01-01 to 1984-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Au Gres Rock → Van Deusen Quarry; 1984-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holzhei Kenneth R & Robin → Van Deusen Quarry; 1984-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holzhei Kenneth R & Robin → Au Gres Rock; 1984-06-27 to current/open; source msha-controller-operator-history