# Relationship history for MSHA mine 4300823

Current hierarchy: **Daniel  Clay → DANIEL S. CLAY EXCAVATION → PORTABLE SCREEN**

- 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:** Daniel S. Clay Excavation → PORTABLE SCREEN; 2024-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel  Clay → PORTABLE SCREEN; 2024-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  Clay → Daniel S. Clay Excavation; 2024-09-09 to current/open; source msha-controller-operator-history