# Relationship history for MSHA mine 1201391

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Midwest Agg., Inc. → Coopers Lane Mine**

- 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:** Liter's Quarry Of Indiana Inc → Coopers Lane Mine; 1950-01-01 to 2006-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert T  Liter et al → Coopers Lane Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert T  Liter et al → Liter's Quarry Of Indiana Inc; 1950-01-01 to 2006-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Coopers Lane Mine; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Midwest Agg., Inc. → Coopers Lane Mine; 2006-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Midwest Agg., Inc.; 2006-01-17 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Coopers Lane Mine; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Midwest Agg., Inc.; 2007-08-23 to current/open; source msha-controller-operator-history