# Relationship history for MSHA mine 4105423

Current hierarchy: **Brenda L  Flood → Concrete Mobility → 4250 Portable Unit# 417**

- 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:** Brenda L  Flood → 4250 Portable Unit# 417; 2005-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Mobility → 4250 Portable Unit# 417; 2019-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda L  Flood → Concrete Mobility; 2019-03-27 to current/open; source msha-controller-operator-history