# Relationship history for MSHA mine 0900241

Current hierarchy: **DIC Corporation → Colors & Effects USA LLC → HARTWELL MINE**

- 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:** Engelhard Corp → HARTWELL MINE; 1950-01-01 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Mearl Corp-Fmp Division → HARTWELL MINE; 1950-01-01 to 1996-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Mearl Corp → HARTWELL MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mearl Corp → Mearl Corp-Fmp Division; 1950-01-01 to 1996-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Engelhard Corp → HARTWELL MINE; 1996-10-21 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Engelhard Corp → Engelhard Corp; 1996-10-21 to 2001-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Engelhard/Mearl Minerals → HARTWELL MINE; 2001-09-01 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Engelhard Corp → HARTWELL MINE; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Engelhard Corp → Engelhard/Mearl Minerals; 2001-09-01 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_mine:** BASF SE → HARTWELL MINE; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → Engelhard Corp; 2006-08-01 to 2001-08-31; source msha-controller-operator-history
- **operator_operates_mine:** BASF Catalysts, LLC → HARTWELL MINE; 2006-08-01 to 2007-02-28; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → BASF Catalysts, LLC; 2006-08-01 to 2007-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Engelhard Corp → BASF Catalysts, LLC; 2006-08-01 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** BASF Corporation → HARTWELL MINE; 2007-03-01 to 2016-06-30; source msha-controller-operator-history
- **controller_controls_mine:** BASF SE → HARTWELL MINE; 2007-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → BASF Corporation; 2007-03-01 to 2016-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Colors & Effects USA LLC → HARTWELL MINE; 2016-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BASF SE → HARTWELL MINE; 2016-07-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → Colors & Effects USA LLC; 2016-07-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_mine:** DIC Corporation → HARTWELL MINE; 2021-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DIC Corporation → Colors & Effects USA LLC; 2021-07-01 to current/open; source msha-controller-operator-history