# Relationship history for MSHA mine 0400158

Current hierarchy: **Heidelberg Materials AG → Lehigh Southwest Cement Co. → Lehigh Permanente 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:** Kaiser Cement Corp → Lehigh Permanente Quarry; 1950-01-01 to 1987-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Kaiser Cement Corp → Lehigh Permanente Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaiser Cement Corp → Kaiser Cement Corp; 1950-01-01 to 1987-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Lehigh Permanente Quarry; 1987-02-23 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Permanente Cement Inc → Lehigh Permanente Quarry; 1987-03-03 to 2008-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Permanente Cement Inc; 1987-03-03 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lehigh Permanente Quarry; 1999-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lehigh Permanente Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Permanente Cement Inc; 2007-08-23 to 2008-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Southwest Cement Co. → Lehigh Permanente Quarry; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Southwest Cement Co.; 2008-07-01 to current/open; source msha-controller-operator-history