# Relationship history for MSHA mine 0102687

Current hierarchy: **Wilks Brothers LLC → CARBO Ceramics Inc → Eufaula 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:** Standard Oil Proppants Company Ltd → Eufaula Plant; 1950-01-01 to 1987-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Corp & Dresser Industries → Eufaula Plant; 1950-01-01 to 1987-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Corp & Dresser Industries → Standard Oil Proppants Company Ltd; 1950-01-01 to 1987-06-29; source msha-controller-operator-history
- **operator_operates_mine:** CARBO Ceramics Inc → Eufaula Plant; 1987-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Kolstad et al → Eufaula Plant; 1987-06-30 to 2020-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Kolstad et al → CARBO Ceramics Inc; 1987-06-30 to 2020-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wilks Brothers LLC → Eufaula Plant; 2020-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilks Brothers LLC → CARBO Ceramics Inc; 2020-07-01 to current/open; source msha-controller-operator-history