# Relationship history for MSHA mine 2500554

Current hierarchy: **Nutrien LTD → PCS Phosphate Company Inc → PCS PHOSPHATE COMPANY INC**

- 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:** Texasgulf Inc → PCS PHOSPHATE COMPANY INC; 1950-01-01 to 1995-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Societe Nationale Elf Aquitaine → PCS PHOSPHATE COMPANY INC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Societe Nationale Elf Aquitaine → Texasgulf Inc; 1950-01-01 to 1995-04-09; source msha-controller-operator-history
- **operator_operates_mine:** PCS Phosphate Company Inc → PCS PHOSPHATE COMPANY INC; 1995-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potash Corp Of Saskatchewan → PCS PHOSPHATE COMPANY INC; 1995-04-10 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Potash Corp Of Saskatchewan → PCS Phosphate Company Inc; 1995-04-10 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Nutrien LTD → PCS PHOSPHATE COMPANY INC; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nutrien LTD → PCS Phosphate Company Inc; 2018-01-01 to current/open; source msha-controller-operator-history