# Relationship history for MSHA mine 2003363

Current hierarchy: **Kelly  Sloothaak → S & M Gravel Company Inc. → S & M Gravel Company Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** K & K Crushing & Leasing LLC → S & M Gravel Company Inc; 2006-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Sloothaak → S & M Gravel Company Inc; 2006-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Sloothaak → K & K Crushing & Leasing LLC; 2006-06-01 to current/open; source msha-controller-operator-history