# Relationship history for MSHA mine 4105581

Current hierarchy: **Christopher W  Hiller → AE Hiller & Sons, Inc → Tierra Sagrada**

- 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:** AE Hiller & Sons, Inc → Tierra Sagrada; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher W  Hiller → Tierra Sagrada; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher W  Hiller → AE Hiller & Sons, Inc; 2021-08-30 to current/open; source msha-controller-operator-history