# Relationship history for MSHA mine 0405884

Current hierarchy: **Altana Group (Germany) → BYK USA LLC → California Hectorite Pit**

- 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

- **controller_controls_mine:** Laporte Plc → California Hectorite Pit; 1991-09-25 to 2002-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Rockwood Specialties Group Inc → California Hectorite Pit; 2002-10-31 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Altana Group (Germany) → California Hectorite Pit; 2013-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BYK Additives Inc. → California Hectorite Pit; 2014-05-22 to 2017-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Rockwood Specialties Group Inc → BYK Additives Inc.; 2014-05-22 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Altana Group (Germany) → BYK Additives Inc.; 2014-05-22 to 2017-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Laporte Plc → BYK Additives Inc.; 2014-05-22 to 2002-10-30; source msha-controller-operator-history
- **operator_operates_mine:** BYK USA LLC → California Hectorite Pit; 2017-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Altana Group (Germany) → California Hectorite Pit; 2017-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altana Group (Germany) → BYK USA LLC; 2017-02-15 to current/open; source msha-controller-operator-history