# Relationship history for MSHA mine 2003274

Current hierarchy: **Lawrence D  Clark → Builders Aggregate → L.D. Clark Aggregate**

- 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:** Lawrence D  Clark → L.D. Clark Aggregate; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Builders Aggregate → L.D. Clark Aggregate; 2003-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence D  Clark → Builders Aggregate; 2003-06-01 to current/open; source msha-controller-operator-history