# Relationship history for MSHA mine 3800308

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC → Lowrys 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Contractors & Materials Inc → Lowrys Quarry; 1950-01-01 to 1987-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Dickerson Group Inc → Lowrys Quarry; 1950-01-01 to 1987-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Dickerson Group Inc → Contractors & Materials Inc; 1950-01-01 to 1987-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → Lowrys Quarry; 1986-02-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Becker Minerals Inc → Lowrys Quarry; 1987-12-07 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → Becker Minerals Inc; 1987-12-07 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Lowrys Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Lowrys Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates East Inc → Lowrys Quarry; 1999-04-12 to 2001-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates East Inc; 1999-04-12 to 2001-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southeast Agg., LLC → Lowrys Quarry; 2001-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Southeast Agg., LLC; 2001-09-13 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lowrys Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC; 2007-08-23 to current/open; source msha-controller-operator-history