# Relationship history for MSHA mine 3600165

Current hierarchy: **Cemex S A → CEMEX Const Materials Atlantic, LLC → Wampum Plant Cemex Inc**

- 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:** Medusa-Crescent Inc → Wampum Plant Cemex Inc; 1950-01-01 to 1979-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Wampum Plant Cemex Inc; 1950-01-01 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa-Crescent Inc; 1950-01-01 to 1979-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → Wampum Plant Cemex Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Wampum Plant Cemex Inc; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → Wampum Plant Cemex Inc; 1979-04-05 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Cement Company; 1979-04-05 to 1988-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Medusa-Crescent Inc → Wampum Plant Cemex Inc; 1988-10-07 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa-Crescent Inc; 1988-10-07 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Wampum Plant Cemex Inc; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → Wampum Plant Cemex Inc; 1998-06-10 to 2001-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1998-06-10 to 2001-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → Wampum Plant Cemex Inc; 2001-02-28 to 2010-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Inc; 2001-02-28 to 2010-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Wampum Plant Cemex Inc; 2008-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Const Materials Atlantic, LLC → Wampum Plant Cemex Inc; 2010-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Const Materials Atlantic, LLC; 2010-03-05 to current/open; source msha-controller-operator-history