# Relationship history for MSHA mine 0405842

Current hierarchy: **Colas S A → United Rock Products → URP Portable 1**

- 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:** Colas S A → URP Portable 1; 1999-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United Rock Products → URP Portable 1; 2012-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → United Rock Products; 2012-04-03 to current/open; source msha-controller-operator-history