# Relationship history for MSHA mine 2300562

Current hierarchy: **John H  Waters → Cimbar Performance Minerals → Fountain Farm 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Baroid Drilling Fluids Inc → Fountain Farm Grinding Plant; 1950-01-01 to 1995-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Nl Industries Inc → Fountain Farm Grinding Plant; 1950-01-01 to 1996-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Nl Industries Inc → Baroid Drilling Fluids Inc; 1950-01-01 to 1995-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Cimbar Performance Minerals → Fountain Farm Grinding Plant; 1995-08-31 to 2003-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Dresser Industries Inc → Fountain Farm Grinding Plant; 1995-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dresser Industries Inc → Cimbar Performance Minerals; 1995-08-31 to 2003-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Halliburton Company → Fountain Farm Grinding Plant; 1998-02-26 to 2003-11-30; source msha-controller-operator-history
- **controller_controls_mine:** John H  Waters → Fountain Farm Grinding Plant; 2003-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cimbar Performance Minerals → Fountain Farm Grinding Plant; 2003-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Cimbar Performance Minerals; 2003-12-02 to 2003-11-30; source msha-controller-operator-history
- **controller_controls_operator:** John H  Waters → Cimbar Performance Minerals; 2003-12-02 to current/open; source msha-controller-operator-history