# Relationship history for MSHA mine 4105507

Current hierarchy: **Arcosa, Inc → Arcosa Aggregates Texas, LLC → McCamey #1896**

- 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 → McCamey #1896; 2018-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → McCamey #1896; 2020-06-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → ACG Materials; 2020-06-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Arcosa Aggregates Texas, LLC → McCamey #1896; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → McCamey #1896; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Arcosa Aggregates Texas, LLC; 2023-01-01 to current/open; source msha-controller-operator-history