# Relationship history for MSHA mine 1516739

Current hierarchy: **Rogers Group Inc → Rogers Group Inc → Princeton Quarry And Mill**

- 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

- **controller_controls_mine:** Rogers Group Inc → Princeton Quarry And Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Princeton Quarry And Mill; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest Inc → Princeton Quarry And Mill; 1989-10-01 to 2000-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest Inc; 1989-10-01 to 2000-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → Princeton Quarry And Mill; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Princeton Quarry And Mill; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest Inc; 2007-08-23 to 2000-11-30; source msha-controller-operator-history