# Relationship history for MSHA mine 1900018

Current hierarchy: **CRH PLC → Oldcastle Lawn & Garden Inc → Oldcastle Lawn and Garden Northeast**

- 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

- **controller_controls_mine:** Medusa Corp → Oldcastle Lawn and Garden Northeast; 1950-01-01 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → Oldcastle Lawn and Garden Northeast; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lee Lime Corp → Oldcastle Lawn and Garden Northeast; 1950-01-01 to 1997-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Martin H  Deely → Oldcastle Lawn and Garden Northeast; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin H  Deely → Lee Lime Corp; 1950-01-01 to 1997-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Oldcastle Lawn and Garden Northeast; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Minerals Company → Oldcastle Lawn and Garden Northeast; 1997-12-09 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Minerals Company; 1997-12-09 to 1998-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → Oldcastle Lawn and Garden Northeast; 1998-06-30 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1998-06-30 to 2000-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → Oldcastle Lawn and Garden Northeast; 2000-11-03 to 2002-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Inc; 2000-11-03 to 2002-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Stone Products → Oldcastle Lawn and Garden Northeast; 2002-10-18 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Oldcastle Lawn and Garden Northeast; 2002-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Stone Products; 2002-10-18 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Oldcastle Lawn and Garden Northeast; 2005-12-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Industrial Minerals → Oldcastle Lawn and Garden Northeast; 2006-01-01 to 2009-05-10; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Industrial Minerals; 2006-01-01 to 2009-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Lawn & Garden Inc → Oldcastle Lawn and Garden Northeast; 2009-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Oldcastle Lawn and Garden Northeast; 2009-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Lawn & Garden Inc; 2009-05-11 to current/open; source msha-controller-operator-history