# Relationship history for MSHA mine 4105151

Current hierarchy: **Quikrete Holdings Inc. → Monarch Mountain Minerals & Aggregates, LLC → Combine Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Quikrete Holdings Inc. → Combine Plant; 2012-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Monarch Mountain Minerals & Aggregates, LLC → Combine Plant; 2015-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Monarch Mountain Minerals & Aggregates, LLC; 2015-10-05 to current/open; source msha-controller-operator-history