# Relationship history for MSHA mine 1102974

Current hierarchy: **Dean  Ekberg → Ekberg Material → WINQUIST 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:** Ekberg Material → WINQUIST QUARRY; 1995-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dean  Ekberg → WINQUIST QUARRY; 1995-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Ekberg → Ekberg Material; 1995-06-01 to current/open; source msha-controller-operator-history