# Relationship history for MSHA mine 3102074

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC → HOLLY SPRINGS 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

- **controller_controls_mine:** Hanson PLC → HOLLY SPRINGS QUARRY; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates → HOLLY SPRINGS QUARRY; 1991-06-01 to 2002-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates; 1991-06-01 to 2002-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southeast Agg., LLC → HOLLY SPRINGS QUARRY; 2002-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Southeast Agg., LLC; 2002-05-08 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → HOLLY SPRINGS QUARRY; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates; 2007-08-23 to 2002-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → HOLLY SPRINGS 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
- **controller_controls_mine:** Martin Marietta Materials Inc → HOLLY SPRINGS QUARRY; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates; 2021-10-01 to 2002-05-07; source msha-controller-operator-history