# Relationship history for MSHA mine 0202345

Current hierarchy: **Stewart  Kessen → Kessen & Kessen Inc → Laguna Quarry East**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Kessen & Kessen Inc → Laguna Quarry East; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stewart  Kessen → Laguna Quarry East; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stewart  Kessen → Kessen & Kessen Inc; 1986-12-01 to current/open; source msha-controller-operator-history