# Relationship history for MSHA mine 4502628

Current hierarchy: **Richard  Hurworth → Delhur Industries Inc → Rains Pit**

- 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:** Samuel G  Hurworth → Rains Pit; 1950-01-01 to 2025-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Delhur Industries Inc → Rains Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel G  Hurworth → Delhur Industries Inc; 1979-01-01 to 2025-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Hurworth → Rains Pit; 2025-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Hurworth → Delhur Industries Inc; 2025-09-17 to current/open; source msha-controller-operator-history