# Relationship history for MSHA mine 4104776

Current hierarchy: **Kirk R  Weatherford → Nex Gen Paving Inc → Mobil Crusher 1**

- 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

- **operator_operates_mine:** Nex Gen Paving Inc → Mobil Crusher 1; 2009-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kirk R  Weatherford → Mobil Crusher 1; 2009-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk R  Weatherford → Nex Gen Paving Inc; 2009-02-13 to current/open; source msha-controller-operator-history