# Relationship history for MSHA mine 1401743

Current hierarchy: **Arcosa, Inc → ACG Materials → ACG Materials Ark City**

- 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:** Charles W  Harrison Jr → ACG Materials Ark City; 1950-01-01 to 2014-07-14; source msha-controller-operator-history
- **operator_operates_mine:** M.K. Crushing. LLC → ACG Materials Ark City; 2012-03-26 to 2014-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Darren G  Wood et al → ACG Materials Ark City; 2012-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darren G  Wood et al → M.K. Crushing. LLC; 2012-03-26 to 2014-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Brian D  Wells et al → M.K. Crushing. LLC; 2012-03-26 to 2014-12-01; source msha-controller-operator-history
- **controller_controls_mine:** H I G Capital LLC → ACG Materials Ark City; 2014-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → ACG Materials Ark City; 2014-12-02 to 2018-12-05; source msha-controller-operator-history
- **controller_controls_operator:** H I G Capital LLC → ACG Materials; 2014-12-02 to 2018-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Harrison Jr → ACG Materials; 2014-12-02 to 2014-07-14; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → ACG Materials Ark City; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → ACG Materials Ark City; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → ACG Materials; 2018-12-06 to current/open; source msha-controller-operator-history