# Relationship history for MSHA mine 3503460

Current hierarchy: **Briggs Russell & James → Alpine Rock Inc → WASH PLANT**

- 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:** Alpine Rock Inc → WASH PLANT; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Briggs Russell & James → WASH PLANT; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Briggs Russell & James → Alpine Rock Inc; 1998-02-01 to current/open; source msha-controller-operator-history