# Relationship history for MSHA mine 3901684

Current hierarchy: **Kelly  Simunek → KD Contractors Inc → Portable 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kelly  Simunek → Portable 2; 2009-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** KD Contractors Inc → Portable 2; 2024-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Simunek → KD Contractors Inc; 2024-06-12 to current/open; source msha-controller-operator-history