# Relationship history for MSHA mine 3001128

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC → Barneveld Plant**

- 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:** Eastern Rock Products Inc → Barneveld Plant; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Barneveld Plant; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Eastern Rock Products Inc; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Barneveld Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Benchmark New York Inc → Barneveld Plant; 1988-11-14 to 2004-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Barneveld Plant; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Benchmark New York Inc; 1988-11-14 to 2004-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Inc → Barneveld Plant; 2004-03-26 to 2004-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Inc; 2004-03-26 to 2004-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast-NY LLC → Barneveld Plant; 2004-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast-NY LLC; 2004-06-08 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Barneveld Plant; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Inc; 2007-08-23 to 2004-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Barneveld Plant; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Barneveld Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates Inc; 2021-10-01 to 2004-06-07; source msha-controller-operator-history