# Relationship history for MSHA mine 4105840

Current hierarchy: **Natalia  Llin; Stephanie  Joyce; Joseph  Joyce → World Tree Materials → World Tree Materials**

- 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:** World Tree Materials → World Tree Materials; 2026-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Natalia  Llin et al → World Tree Materials; 2026-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Natalia  Llin et al → World Tree Materials; 2026-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Joyce et al → World Tree Materials; 2026-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephanie  Joyce et al → World Tree Materials; 2026-01-16 to current/open; source msha-controller-operator-history