# Relationship history for MSHA mine 1901328

Current hierarchy: **Christopher W Our; John D Our → Robert B. Our Co., Inc. → Trommel Screen**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Robert B. Our Co., Inc. → Trommel Screen; 2025-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher W Our et al → Trommel Screen; 2025-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher W Our et al → Robert B. Our Co., Inc.; 2025-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D Our et al → Robert B. Our Co., Inc.; 2025-10-17 to current/open; source msha-controller-operator-history