# Relationship history for MSHA mine 4105032

Current hierarchy: **John B  Frerich → Mobile Crushing & Screening Inc. → Portable 4  Kleemann**

- 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:** Mobile Crushing & Screening Inc. → Portable 4  Kleemann; 2013-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John B  Frerich → Portable 4  Kleemann; 2013-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John B  Frerich → Mobile Crushing & Screening Inc.; 2013-07-31 to current/open; source msha-controller-operator-history