# Relationship history for MSHA mine 4800152

Current hierarchy: **WE Soda US LLC → WE Soda Alkali, LLC → WE Soda @ WESTVACO**

- 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:** FMC Corp → WE Soda @ WESTVACO; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** FMC Corp → WE Soda @ WESTVACO; 1978-03-09 to 2015-03-31; source msha-controller-operator-history
- **controller_controls_operator:** FMC Corp → FMC Corp; 1978-03-09 to 2015-03-31; source msha-controller-operator-history
- **operator_operates_mine:** WE Soda Alkali, LLC → WE Soda @ WESTVACO; 2015-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tronox Limited → WE Soda @ WESTVACO; 2015-04-01 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Tronox Limited → WE Soda Alkali, LLC; 2015-04-01 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Genesis Energy LP → WE Soda @ WESTVACO; 2017-09-01 to 2025-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Genesis Energy LP → WE Soda Alkali, LLC; 2017-09-01 to 2025-02-27; source msha-controller-operator-history
- **controller_controls_mine:** WE Soda US LLC → WE Soda @ WESTVACO; 2025-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** WE Soda US LLC → WE Soda Alkali, LLC; 2025-02-28 to current/open; source msha-controller-operator-history