# Relationship history for MSHA mine 0405821

Current hierarchy: **Nina  Moyers → Arizona Pipeline Company → Portable Operation A**

- 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:** Arizona Pipeline Company → Portable Operation A; 2011-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nina  Moyers → Portable Operation A; 2011-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nina  Moyers → Arizona Pipeline Company; 2011-04-13 to current/open; source msha-controller-operator-history