# Relationship history for MSHA mine 0203187

Current hierarchy: **Quikrete Holdings Inc. → Western Aggregates L.L.C. → D41**

- 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:** Western Aggregates L.L.C. → D41; 2007-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Schlegel → D41; 2007-06-27 to 2011-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Schlegel → Western Aggregates L.L.C.; 2007-06-27 to 2011-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → D41; 2012-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Western Aggregates L.L.C.; 2012-01-01 to current/open; source msha-controller-operator-history