# Relationship history for MSHA mine 4800639

Current hierarchy: **FMC Corp → FMC Corp → FMC @ GRANGER**

- 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:** Tg Soda Ash Inc → FMC @ GRANGER; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Societe Nationale Elf Aquitaine → FMC @ GRANGER; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Societe Nationale Elf Aquitaine → Tg Soda Ash Inc; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** FMC Corp → FMC @ GRANGER; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** FMC Corp → FMC @ GRANGER; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** FMC Corp → FMC Corp; 1999-07-01 to current/open; source msha-controller-operator-history