# Relationship history for MSHA mine 4100298

Current hierarchy: **Altana Group (Germany) → BYK USA LLC → BYK USA LLC Plants & Pits**

- 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:** Southern Clay Products Inc → BYK USA LLC Plants & Pits; 1950-01-01 to 1991-09-24; source msha-controller-operator-history
- **controller_controls_mine:** English China Clays PLC → BYK USA LLC Plants & Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** English China Clays PLC → Southern Clay Products Inc; 1950-01-01 to 1991-09-24; source msha-controller-operator-history
- **operator_operates_mine:** BYK Additives Inc. → BYK USA LLC Plants & Pits; 1991-09-25 to 2017-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Laporte Plc → BYK USA LLC Plants & Pits; 1991-09-25 to 2002-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Laporte Plc → BYK Additives Inc.; 1991-09-25 to 2002-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Rockwood Specialties Group Inc → BYK USA LLC Plants & Pits; 2002-10-31 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Rockwood Specialties Group Inc → BYK Additives Inc.; 2002-10-31 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Altana Group (Germany) → BYK USA LLC Plants & Pits; 2013-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altana Group (Germany) → BYK Additives Inc.; 2013-10-01 to 2017-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Altana Group (Germany) → BYK USA LLC Plants & Pits; 2017-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BYK USA LLC → BYK USA LLC Plants & Pits; 2017-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altana Group (Germany) → BYK USA LLC; 2017-02-22 to current/open; source msha-controller-operator-history