# Relationship history for MSHA mine 2902400

Current hierarchy: **Chris  Brosious → H & H Brosious LLC → Portable #4**

- 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:** Chris  Brosious → Portable #4; 2004-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & H Brosious LLC → Portable #4; 2009-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Brosious → H & H Brosious LLC; 2009-11-12 to current/open; source msha-controller-operator-history