# Relationship history for MSHA mine 3600166

Current hierarchy: **Cementir Holding; Cemex SA → Lehigh White Cement Company, LLC → Lehigh White Cement Company, LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Heidelberg Materials AG → Lehigh White Cement Company, LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → Lehigh White Cement Company, LLC; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Lehigh White Cement Company, LLC; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Cement Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → Lehigh White Cement Company, LLC; 1979-01-01 to 1982-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Lehigh White Cement Company, LLC; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Cement Company; 1979-01-01 to 1982-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Portland Cement Company → Lehigh White Cement Company, LLC; 1982-10-05 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Portland Cement Company; 1982-10-05 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lehigh White Cement Company, LLC; 2000-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Cement Company, LLC → Lehigh White Cement Company, LLC; 2002-02-01 to 2018-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Cement Company, LLC; 2002-02-01 to 2018-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh White Cement Company, LLC → Lehigh White Cement Company, LLC; 2018-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cementir Holding et al → Lehigh White Cement Company, LLC; 2018-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cementir Holding et al → Lehigh White Cement Company, LLC; 2018-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex SA  et al → Lehigh White Cement Company, LLC; 2018-04-01 to current/open; source msha-controller-operator-history