# Relationship history for MSHA mine 4202147

Current hierarchy: **Chief Consolidated Mining Company → Chief Consolidated Mining Company → CHIEF NO 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Chief Consolidated Mining Company → CHIEF NO 2; 1993-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chief Consolidated Mining Company → CHIEF NO 2; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chief Consolidated Mining Company → Chief Consolidated Mining Company; 1996-09-01 to current/open; source msha-controller-operator-history