# Relationship history for MSHA mine 1002225

Current hierarchy: **Bryant C  Smith; Donna J  Smith → Bryant Smith Projects → Smith Portable Crushing**

- 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:** Bryant Smith Projects → Smith Portable Crushing; 2011-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryant C  Smith et al → Smith Portable Crushing; 2011-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryant C  Smith et al → Bryant Smith Projects; 2011-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donna J  Smith et al → Bryant Smith Projects; 2011-12-06 to current/open; source msha-controller-operator-history