# Relationship history for MSHA mine 2003117

Current hierarchy: **Robert V  Huyck; Beverly  Huyck → VERN HUYCK TRUCKING, INC. → 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

- **operator_operates_mine:** Vern Huyck Trucking Inc → SCREEN PLANT; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beverly  Huyck et al → SCREEN PLANT; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beverly  Huyck et al → Vern Huyck Trucking Inc; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert V  Huyck et al → Vern Huyck Trucking Inc; 1999-06-01 to current/open; source msha-controller-operator-history