# Relationship history for MSHA mine 0405168

Current hierarchy: **Ruben  Aman; Steven  Aman → Aman Brothers Inc → Portable Plant E**

- 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

- **controller_controls_mine:** Ruben  Aman  et al → Portable Plant E; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aman Brothers Inc → Portable Plant E; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Aman  et al → Aman Brothers Inc; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Aman  et al → Aman Brothers Inc; 1991-10-01 to current/open; source msha-controller-operator-history