# Relationship history for MSHA mine 1202113

Current hierarchy: **Charles J  McCurdy → Brookfield Sand & Gravel Inc → CARDINAL SAND & GRAVEL**

- 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:** Brookfield Sand & Gravel Inc → CARDINAL SAND & GRAVEL; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles J  McCurdy → CARDINAL SAND & GRAVEL; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  McCurdy → Brookfield Sand & Gravel Inc; 1992-01-01 to current/open; source msha-controller-operator-history