# Relationship history for MSHA mine 4300496

Current hierarchy: **Harrison Helen & Royal → Slate Products Inc → CLAY 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

- **controller_controls_mine:** Harrison Helen & Royal → CLAY QUARRY; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Slate Products Inc → CLAY QUARRY; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Helen & Royal → Slate Products Inc; 1996-01-01 to current/open; source msha-controller-operator-history