# Relationship history for MSHA mine 0900053

Current hierarchy: **Cemex S A → Cemex Southeast LLC → Clinchfield 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Southdown Inc → Clinchfield Plant; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → Clinchfield Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → Clinchfield Plant; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Clinchfield Plant; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Cement Company; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Medusa-Citadel Inc → Clinchfield Plant; 1988-10-07 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Clinchfield Plant; 1988-10-07 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa-Citadel Inc; 1988-10-07 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Clinchfield Plant; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → Clinchfield Plant; 1998-06-30 to 2001-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1998-06-30 to 2001-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → Clinchfield Plant; 2001-07-10 to 2010-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Inc; 2001-07-10 to 2010-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Southeast LLC → Clinchfield Plant; 2010-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Clinchfield Plant; 2010-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Southeast LLC; 2010-08-23 to current/open; source msha-controller-operator-history