# Relationship history for MSHA mine 0200855

Current hierarchy: **Grupo Mexico S A B de C V → Asarco Inc → MISSION MILL**

- 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:** Asarco Inc → MISSION MILL; 1950-01-01 to 1999-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Asarco Inc → MISSION MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1950-01-01 to 1999-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → MISSION MILL; 1999-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grupo Mexico S A B de C V → MISSION MILL; 1999-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grupo Mexico S A B de C V → Asarco Inc; 1999-11-17 to current/open; source msha-controller-operator-history