# Relationship history for MSHA mine 2003236

Current hierarchy: **Kenneth  Coryell → Ken Coryell Trucking Inc → Chieftain**

- 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:** Kenneth  Coryell → Chieftain; 1998-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ken Coryell Trucking Inc → Chieftain; 2001-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Coryell → Ken Coryell Trucking Inc; 2001-10-22 to current/open; source msha-controller-operator-history