# Relationship history for MSHA mine 4502578

Current hierarchy: **Verbeck Ronald → Verbeck Brothers Inc → Buck Pass Pit**

- 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:** United States Government → Buck Pass Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Forest Service → Buck Pass Pit; 1978-03-09 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1978-03-09 to 1978-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Verbeck Brothers Inc → Buck Pass Pit; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Verbeck Ronald → Buck Pass Pit; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Verbeck Ronald → Verbeck Brothers Inc; 1978-09-01 to current/open; source msha-controller-operator-history