# Relationship history for MSHA mine 1401782

Current hierarchy: **Stacey  Theis; Thomas  Theis → Hy-Grade Aggregates, LLC → Penalosa 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

- **operator_operates_mine:** Hy-Grade Aggregates, LLC → Penalosa Sand Plant; 2016-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacey  Theis et al → Penalosa Sand Plant; 2016-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacey  Theis et al → Hy-Grade Aggregates, LLC; 2016-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Theis et al → Hy-Grade Aggregates, LLC; 2016-09-30 to current/open; source msha-controller-operator-history