# Relationship history for MSHA mine 4105396

Current hierarchy: **Richard  Hurworth → DelHur Industries, Inc. → Cactus**

- 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 → Cactus; 1950-01-01 to 2025-09-16; source msha-controller-operator-history
- **operator_operates_mine:** DelHur Industries, Inc. → Cactus; 2018-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel G  Hurworth → DelHur Industries, Inc.; 2018-11-13 to 2025-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Hurworth → Cactus; 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