# Relationship history for MSHA mine 4703458

Current hierarchy: **Keith  Baughman; Shirley  Baughman → Baughman Trucking & Excavating LLC → Screen Plant**

- 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

- **controller_controls_mine:** Keith  Baughman et al → Screen Plant; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baughman Trucking & Excavating LLC → Screen Plant; 2006-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Baughman et al → Baughman Trucking & Excavating LLC; 2006-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Baughman et al → Baughman Trucking & Excavating LLC; 2006-05-03 to current/open; source msha-controller-operator-history