# Relationship history for MSHA mine 3603432

Current hierarchy: **CRH PLC → Pennsy Supply Inc → Thomasville Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Medusa Minerals Company → Thomasville Mine; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Thomasville Mine; 1950-01-01 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Minerals Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → Thomasville Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thomasville Stone & Lime Company → Thomasville Mine; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Thomasville Mine; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Thomasville Stone & Lime Company; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Minerals Company → Thomasville Mine; 1988-10-07 to 1998-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Minerals Company; 1988-10-07 to 1998-06-02; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Thomasville Mine; 1993-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Thomasville Mine; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → Thomasville Mine; 1998-06-03 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1998-06-03 to 2000-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → Thomasville Mine; 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 → Thomasville Mine; 2002-10-18 to 2005-12-14; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Thomasville Mine; 2002-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Stone Products; 2002-10-18 to 2005-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Industrial Minerals → Thomasville Mine; 2005-12-15 to 2008-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Thomasville Mine; 2005-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Industrial Minerals; 2005-12-15 to 2008-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pennsy Supply Inc → Thomasville Mine; 2009-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pennsy Supply Inc; 2009-01-01 to current/open; source msha-controller-operator-history