# Relationship history for MSHA mine 3003828

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → SANDVIK QA441#983**

- 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 → SANDVIK QA441#983; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Carver P  Laraway et al → SANDVIK QA441#983; 1995-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → SANDVIK QA441#983; 2007-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carver Sand and Gravel LLC → SANDVIK QA441#983; 2011-12-01 to 2025-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Carver P  Laraway et al → Carver Sand and Gravel LLC; 2011-12-01 to 2025-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → SANDVIK QA441#983; 2025-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2025-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2025-05-23 to 2007-08-22; source msha-controller-operator-history