# Relationship history for MSHA mine 2402231

Current hierarchy: **Craig S  Smith → Craig Smith Enterprises → Portable**

- 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

- **operator_operates_mine:** Craig Smith Enterprises → Portable; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig S  Smith → Portable; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig S  Smith → Craig Smith Enterprises; 2001-09-01 to current/open; source msha-controller-operator-history