# Relationship history for MSHA mine 0405616

Current hierarchy: **Lee W  Hall → Cobalt Crushing → Snow's 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:** Lee W  Hall → Snow's Quarry; 1993-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cobalt Crushing → Snow's Quarry; 2004-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee W  Hall → Cobalt Crushing; 2004-10-28 to current/open; source msha-controller-operator-history