# Relationship history for MSHA mine 4105227

Current hierarchy: **Celeste  Raitz; Casey  Raitz → U S Sand and Gravel → AB 406 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** U S Sand and Gravel → AB 406 Pit; 2016-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Casey  Raitz et al → AB 406 Pit; 2016-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Casey  Raitz et al → U S Sand and Gravel; 2016-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Celeste  Raitz et al → U S Sand and Gravel; 2016-12-01 to current/open; source msha-controller-operator-history