# Relationship history for MSHA mine 4703680

Current hierarchy: **Jerome  Trapp → Quality Aggregate → Portable**

- 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:** Quality Aggregate → Portable; 2013-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Trapp → Portable; 2013-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Trapp → Quality Aggregate; 2013-05-08 to current/open; source msha-controller-operator-history