# Relationship history for MSHA mine 2902323

Current hierarchy: **Rock I.  Southway → Rock Products, Inc → Crusher 10**

- 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

- **operator_operates_mine:** Rock Products, Inc → Crusher 10; 2006-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rock I.  Southway → Crusher 10; 2006-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rock I.  Southway → Rock Products, Inc; 2006-05-26 to current/open; source msha-controller-operator-history