# Relationship history for MSHA mine 0405937

Current hierarchy: **Amanda  Hoy → White Bear Construction, Inc. → Portable**

- 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:** White Bear Construction, Inc. → Portable; 2019-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amanda  Hoy → Portable; 2019-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amanda  Hoy → White Bear Construction, Inc.; 2019-05-10 to current/open; source msha-controller-operator-history