# Relationship history for MSHA mine 0900305

Current hierarchy: **CRH PLC → Old Castle Materials → Rossville 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:** Stone Man Inc → Rossville Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Rossville Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Stone Man Inc; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Southeast Inc → Rossville Quarry; 1988-11-14 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Rossville Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Southeast Inc; 1988-11-14 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Rossville Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Rossville Quarry; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Stoneman, Inc. → Rossville Quarry; 2002-02-01 to 2003-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Stoneman, Inc.; 2002-02-01 to 2003-10-21; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Rossville Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SRM Aggregates → Rossville Quarry; 2003-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → SRM Aggregates; 2003-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → SRM Aggregates; 2003-10-22 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Rossville Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Southeast Inc; 2007-08-23 to 2002-01-31; source msha-controller-operator-history