# Relationship history for MSHA mine 2902556

Current hierarchy: **Nathaniel  Vaughn; Misty M Vaughn; Alan C Vaughn; Sheri L Vaughn → Halo Services, Inc → WIPP Road #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:** Halo Services, Inc → WIPP Road #1; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alan C Vaughn et al → WIPP Road #1; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan C Vaughn et al → Halo Services, Inc; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathaniel  Vaughn et al → Halo Services, Inc; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Misty M Vaughn et al → Halo Services, Inc; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheri L Vaughn et al → Halo Services, Inc; 2024-01-16 to current/open; source msha-controller-operator-history