# Relationship history for MSHA mine 4500042

Current hierarchy: **Lafarge S A → Lafarge Corp → Metaline Falls Washington Plant Of Lafar**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Lehigh Portland Cement Company → Metaline Falls Washington Plant Of Lafar; 1950-01-01 to 1989-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Metaline Falls Washington Plant Of Lafar; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Portland Cement Company; 1950-01-01 to 1989-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Metaline Falls Washington Plant Of Lafar; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Metaline Falls Washington Plant Of Lafar; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1989-06-01 to current/open; source msha-controller-operator-history