# Relationship history for MSHA mine 3004158

Current hierarchy: **Duane J  LaFever → DELAWARE SAND & GRAVEL → FREEDOM 1776 - HAMDEN QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Delaware Sand & Gravel → FREEDOM 1776 - HAMDEN QUARRY; 2025-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duane J  LaFever → FREEDOM 1776 - HAMDEN QUARRY; 2025-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane J  LaFever → Delaware Sand & Gravel; 2025-06-16 to current/open; source msha-controller-operator-history