# Relationship history for MSHA mine 0405370

Current hierarchy: **Joseph G  Schlegel → Schlegel North County Sand & Gravel, Inc. → Schlegel North County Sand & Gravel, 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:** Borzini North County Sand & Gravel → Schlegel North County Sand & Gravel, Inc; 1999-06-01 to 2010-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Lew K  Borzini → Schlegel North County Sand & Gravel, Inc; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lew K  Borzini → Borzini North County Sand & Gravel; 1999-06-01 to 2010-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Schlegel North County Sand & Gravel, Inc. → Schlegel North County Sand & Gravel, Inc; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph G  Schlegel → Schlegel North County Sand & Gravel, Inc; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph G  Schlegel → Schlegel North County Sand & Gravel, Inc.; 2010-07-01 to current/open; source msha-controller-operator-history