# Relationship history for MSHA mine 3901618

Current hierarchy: **Lynette M Williamson; Melvin L Williamson → Williamson Trucking LLC → Williamson Trucking**

- 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:** Williamson Trucking LLC → Williamson Trucking; 2016-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynette M Williamson et al → Williamson Trucking; 2016-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynette M Williamson et al → Williamson Trucking LLC; 2016-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melvin L Williamson et al → Williamson Trucking LLC; 2016-05-10 to current/open; source msha-controller-operator-history