# Relationship history for MSHA mine 0404964

Current hierarchy: **Ruben  Aman; Steven  Aman → Aman Brothers Inc → PORTABLE PLANT B""**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Steven  Aman  et al → PORTABLE PLANT B""; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aman Brothers Inc → PORTABLE PLANT B""; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Aman  et al → Aman Brothers Inc; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Aman  et al → Aman Brothers Inc; 1988-08-01 to current/open; source msha-controller-operator-history