# Relationship history for MSHA mine 1200442

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Midwest, LLC → Lower Huntington 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Midwest Aggregates Corp → Lower Huntington Quarry; 1950-01-01 to 1981-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Old Fort Industries Inc → Lower Huntington Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Old Fort Industries Inc → Midwest Aggregates Corp; 1950-01-01 to 1981-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Johnson S E Companies Inc → Lower Huntington Quarry; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Allen County Aggregates Inc → Lower Huntington Quarry; 1981-10-10 to 1985-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Eickhoff → Lower Huntington Quarry; 1981-10-10 to 1985-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Eickhoff → Allen County Aggregates Inc; 1981-10-10 to 1985-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco Inc → Lower Huntington Quarry; 1985-03-19 to 2003-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Stoneco Inc; 1985-03-19 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Lower Huntington Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Lower Huntington Quarry; 2003-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco Inc; 2003-06-16 to 2003-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest, LLC → Lower Huntington Quarry; 2003-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest, LLC; 2003-07-13 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lower Huntington Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest, LLC; 2007-08-23 to current/open; source msha-controller-operator-history