# Relationship history for MSHA mine 4703223

Current hierarchy: **John (Jack)  Treml → Casco Sand & Gravel Co., LLC → CASCO SAND & GRAVEL CO., LLC**

- 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:** Casco Sand & Gravel Company Llc → CASCO SAND & GRAVEL CO., LLC; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John (Jack)  Treml → CASCO SAND & GRAVEL CO., LLC; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John (Jack)  Treml → Casco Sand & Gravel Company Llc; 1999-10-01 to current/open; source msha-controller-operator-history