# Relationship history for MSHA mine 1601582

Current hierarchy: **Stacey  Cambre; Shane  Cambre → Northern Sand and Gravel LLC → West Fontana 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

- **operator_operates_mine:** Northern Sand and Gravel LLC → West Fontana Pit; 2019-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacey  Cambre et al → West Fontana Pit; 2019-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacey  Cambre et al → Northern Sand and Gravel LLC; 2019-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane  Cambre et al → Northern Sand and Gravel LLC; 2019-02-04 to current/open; source msha-controller-operator-history