# Relationship history for MSHA mine 1100068

Current hierarchy: **Heidelberg Materials AG → Hanson Material Service → Federal 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:** Hanson Material Service → Federal Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Federal Quarry; 1950-01-01 to 2006-06-15; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Hanson Material Service; 1950-01-01 to 2006-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Federal Quarry; 2006-06-16 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Material Service; 2006-06-16 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Federal Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Material Service; 2007-08-23 to current/open; source msha-controller-operator-history