# Relationship history for MSHA mine 3300175

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Midwest Agg, Inc. → Wagner Quarries**

- 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:** The Wagner Quarries Company → Wagner Quarries; 1950-01-01 to 2003-07-25; source msha-controller-operator-history
- **controller_controls_mine:** The Wagner Quarries Company → Wagner Quarries; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Wagner Quarries Company → The Wagner Quarries Company; 1950-01-01 to 2003-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Wagner Quarries; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Midwest Agg, Inc. → Wagner Quarries; 2003-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Midwest Agg, Inc.; 2003-07-26 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Wagner Quarries; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Midwest Agg, Inc.; 2007-08-23 to current/open; source msha-controller-operator-history