# Relationship history for MSHA mine 3401660

Current hierarchy: **Arcosa, Inc → Arcosa Specialty Materials → Diamond #1885**

- 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 → Diamond #1885; 1950-01-01 to 2014-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Clayton  Hufnagel → Diamond #1885; 1988-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Gypsum Company → Diamond #1885; 1988-11-01 to 2017-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Clayton  Hufnagel → Diamond Gypsum Company; 1988-11-01 to 2017-07-24; source msha-controller-operator-history
- **controller_controls_mine:** H I G Capital LLC → Diamond #1885; 2014-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → Diamond #1885; 2017-07-25 to 2018-12-05; source msha-controller-operator-history
- **controller_controls_operator:** H I G Capital LLC → ACG Materials; 2017-07-25 to 2018-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Harrison Jr → ACG Materials; 2017-07-25 to 2014-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Arcosa Specialty Materials → Diamond #1885; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → Diamond #1885; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Arcosa Specialty Materials; 2018-12-06 to current/open; source msha-controller-operator-history