# Relationship history for MSHA mine 3600185

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials US Cement LLC → EVANSVILLE 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

- **controller_controls_mine:** Heidelberg Materials AG → EVANSVILLE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** National Gypsum Company → EVANSVILLE PLANT; 1950-01-01 to 1985-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → EVANSVILLE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → National Gypsum Company; 1950-01-01 to 1985-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Allentown Cement Company Inc → EVANSVILLE PLANT; 1985-06-14 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Mahan  et al → EVANSVILLE PLANT; 1985-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Mahan  et al → Allentown Cement Company Inc; 1985-06-14 to 1987-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Allentown Cement Company Inc → EVANSVILLE PLANT; 1987-02-04 to 1990-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Transtech Industries Inc → EVANSVILLE PLANT; 1987-02-04 to 1990-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Transtech Industries Inc → Allentown Cement Company Inc; 1987-02-04 to 1990-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Allentown Cement Company Inc → EVANSVILLE PLANT; 1990-10-03 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Scancem Ans → EVANSVILLE PLANT; 1990-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scancem Ans → Allentown Cement Company Inc; 1990-10-03 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → EVANSVILLE PLANT; 2000-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Portland Cement Company → EVANSVILLE PLANT; 2001-01-01 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Portland Cement Company; 2001-01-01 to 2002-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials US Cement LLC → EVANSVILLE PLANT; 2002-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials US Cement LLC; 2002-02-01 to current/open; source msha-controller-operator-history