# Relationship history for MSHA mine 4300625

Current hierarchy: **Nelson  Dunster → K-D Stone 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:** Nelson  Dunster → Clay Quarry; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K-D Stone Inc → Clay Quarry; 2005-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson  Dunster → K-D Stone Inc; 2005-04-17 to current/open; source msha-controller-operator-history