# Relationship history for MSHA mine 2104109

Current hierarchy: **Kyle J  Simonson → D&B Construction & Landscaping → Qualley Pit  East**

- 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:** D&B Construction & Landscaping → Qualley Pit  East; 2025-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kyle J  Simonson → Qualley Pit  East; 2025-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle J  Simonson → D&B Construction & Landscaping; 2025-08-19 to current/open; source msha-controller-operator-history