# Relationship history for MSHA mine 3609324

Current hierarchy: **J Kevan  Busik → Delaware Quarries Inc → Riverton Sand & Gravel**

- 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

- **controller_controls_mine:** Stabler Companies Inc → Riverton Sand & Gravel; 1950-01-01 to 2008-01-31; source msha-controller-operator-history
- **controller_controls_mine:** J Kevan  Busik  et al → Riverton Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Industries Inc → Riverton Sand & Gravel; 2005-04-19 to 2008-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Stabler Companies Inc → Eastern Industries Inc; 2005-04-19 to 2008-01-31; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Riverton Sand & Gravel; 2008-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Eastern Industries Inc; 2008-02-01 to 2008-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Delaware Quarries Inc → Riverton Sand & Gravel; 2008-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Kevan  Busik  et al → Delaware Quarries Inc; 2008-06-13 to current/open; source msha-controller-operator-history