# Relationship history for MSHA mine 3400892

Current hierarchy: **CRH PLC → Holliday Sand & Gravel → Coweta Plant #10**

- 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

- **controller_controls_mine:** List & Clark Construction Company → Coweta Plant #10; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coweta Sand & Materials Inc → Coweta Plant #10; 1950-01-01 to 1982-11-17; source msha-controller-operator-history
- **controller_controls_mine:** L R  Le Neve → Coweta Plant #10; 1950-01-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_operator:** L R  Le Neve → Coweta Sand & Materials Inc; 1950-01-01 to 1982-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Coweta Sand Company → Coweta Plant #10; 1982-11-18 to 1986-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Rector → Coweta Plant #10; 1982-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Rector → Coweta Sand Company; 1982-11-18 to 1986-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Coweta Sand Inc → Coweta Plant #10; 1986-01-30 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Parrott → Coweta Plant #10; 1986-01-30 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Parrott → Coweta Sand Inc; 1986-01-30 to 1990-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Southern Quikrete Products → Coweta Plant #10; 1990-02-06 to 1994-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Mason → Coweta Plant #10; 1990-02-06 to 1994-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Mason → Southern Quikrete Products; 1990-02-06 to 1994-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Coweta Sand Company → Coweta Plant #10; 1994-06-01 to 1997-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Jones → Coweta Plant #10; 1994-06-01 to 1997-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Jones → Coweta Sand Company; 1994-06-01 to 1997-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel Company → Coweta Plant #10; 1997-01-17 to 2008-07-31; source msha-controller-operator-history
- **controller_controls_operator:** List & Clark Construction Company → Holliday Sand & Gravel Company; 1997-01-17 to 2008-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel → Coweta Plant #10; 2008-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Coweta Plant #10; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Holliday Sand & Gravel; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Coweta Plant #10; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Holliday Sand & Gravel; 2018-06-21 to current/open; source msha-controller-operator-history