# Relationship history for MSHA mine 4103033

Current hierarchy: **Schlumberger Ltd → M-I L.L.C. (MI SWACO) → M-I L.L.C.-Brownsville Grinding 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Halliburton Company → M-I L.L.C.-Brownsville Grinding Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Imco Services → M-I L.L.C.-Brownsville Grinding Plant; 1980-09-01 to 1987-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Imco Services; 1980-09-01 to 1987-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Halliburton Co et al → M-I L.L.C.-Brownsville Grinding Plant; 1987-01-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M-I Drilling Fluids Company → M-I L.L.C.-Brownsville Grinding Plant; 1987-01-20 to 1994-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Co et al → M-I Drilling Fluids Company; 1987-01-20 to 1994-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Dresser Industries Inc et al → M-I Drilling Fluids Company; 1987-01-20 to 1994-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Schlumberger Ltd → M-I L.L.C.-Brownsville Grinding Plant; 1994-02-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Western Clay Company Llc → M-I L.L.C.-Brownsville Grinding Plant; 1994-08-02 to 1998-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Columbia Ventures → M-I L.L.C.-Brownsville Grinding Plant; 1994-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Columbia Ventures → Columbia Western Clay Company Llc; 1994-08-02 to 1998-01-12; source msha-controller-operator-history
- **operator_operates_mine:** U S Clay L P → M-I L.L.C.-Brownsville Grinding Plant; 1998-01-13 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Graves et al → M-I L.L.C.-Brownsville Grinding Plant; 1998-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Graves et al → U S Clay L P; 1998-01-13 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Wesley  Burkett et al → U S Clay L P; 1998-01-13 to 2002-04-25; source msha-controller-operator-history
- **operator_operates_mine:** U S Clay L P → M-I L.L.C.-Brownsville Grinding Plant; 2002-04-26 to 2009-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Schlumberger Ltd → M-I L.L.C.-Brownsville Grinding Plant; 2002-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schlumberger Ltd → U S Clay L P; 2002-04-26 to 2009-06-25; source msha-controller-operator-history
- **operator_operates_mine:** M-I L.L.C. (MI SWACO) → M-I L.L.C.-Brownsville Grinding Plant; 2009-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schlumberger Ltd → M-I L.L.C. (MI SWACO); 2009-06-26 to current/open; source msha-controller-operator-history