# Relationship history for MSHA mine 0300537

Current hierarchy: **CPS Performance Materials → G2O Technologies → Little Rock 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Stauffer Chemical Company → Little Rock Plant; 1950-01-01 to 1987-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Unilever United States Inc → Little Rock Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Unilever United States Inc → Stauffer Chemical Company; 1950-01-01 to 1987-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Rhone-Poulenc Basic Chemicals Company → Little Rock Plant; 1987-12-01 to 1993-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Rhone-Poulenc S A → Little Rock Plant; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhone-Poulenc S A → Rhone-Poulenc Basic Chemicals Company; 1987-12-01 to 1993-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Geo Specialty Chemicals → Little Rock Plant; 1993-02-05 to 2019-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Ken  Ghazey → Little Rock Plant; 1993-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Ghazey → Geo Specialty Chemicals; 1993-02-05 to 2019-09-02; source msha-controller-operator-history
- **operator_operates_mine:** G2O Technologies → Little Rock Plant; 2019-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CPS Performance Materials → Little Rock Plant; 2019-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CPS Performance Materials → G2O Technologies; 2019-09-03 to current/open; source msha-controller-operator-history