# Relationship history for MSHA mine 3503990

Current hierarchy: **Jeff  Brink; Joel  Zeni → Brink Brothers Inc → Portable 1**

- 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:** Brink Brothers Inc → Portable 1; 2026-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Zeni et al → Portable 1; 2026-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Zeni et al → Brink Brothers Inc; 2026-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Brink et al → Brink Brothers Inc; 2026-08-20 to current/open; source msha-controller-operator-history