# Relationship history for MSHA mine 2003696

Current hierarchy: **Chad L  Listerman → ECC Enterprises → Westbrook Pit**

- 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:** Chad L  Listerman → Westbrook Pit; 2010-03-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ECC Enterprises → Westbrook Pit; 2025-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad L  Listerman → ECC Enterprises; 2025-11-07 to current/open; source msha-controller-operator-history