# Relationship history for MSHA mine 1901232

Current hierarchy: **Jessica  Russell → Jessica Russell → Extec  6000S S/N 5045**

- 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:** Jessica Russell → Extec  6000S S/N 5045; 2012-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jessica  Russell → Extec  6000S S/N 5045; 2012-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jessica  Russell → Jessica Russell; 2012-05-10 to current/open; source msha-controller-operator-history