# Relationship history for MSHA mine 2902432

Current hierarchy: **Les  Wilderman → Taos Gravel Products → Sand Plant**

- 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

- **controller_controls_mine:** Joel M Perovich → Sand Plant; 1992-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Les  Wilderman → Sand Plant; 2005-09-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Perovich Properties Inc. → Sand Plant; 2012-10-04 to 2026-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Joel M Perovich → Perovich Properties Inc.; 2012-10-04 to 2026-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Taos Gravel Products → Sand Plant; 2026-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Les  Wilderman → Taos Gravel Products; 2026-01-26 to current/open; source msha-controller-operator-history