# Relationship history for MSHA mine 4105454

Current hierarchy: **Arcosa, Inc → ACG Materials → Bruni # 1892**

- 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:** Arcosa, Inc → Bruni # 1892; 2018-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → Bruni # 1892; 2019-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → ACG Materials; 2019-09-04 to current/open; source msha-controller-operator-history