# Relationship history for MSHA mine 4703017

Current hierarchy: **Wayne C  Stewart → W C Stewart Construction Inc → Krug Sand Operation**

- 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:** Wayne C  Stewart → Krug Sand Operation; 1992-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W C Stewart Construction Inc → Krug Sand Operation; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne C  Stewart → W C Stewart Construction Inc; 1994-05-01 to current/open; source msha-controller-operator-history