# Relationship history for MSHA mine 4801667

Current hierarchy: **Clayton W  Cheeney → Nowood Construction Inc → Screening 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:** Nowood Construction Inc → Screening Plant; 2005-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clayton W  Cheeney → Screening Plant; 2005-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clayton W  Cheeney → Nowood Construction Inc; 2005-01-20 to current/open; source msha-controller-operator-history