# Relationship history for MSHA mine 3402121

Current hierarchy: **H I G Capital LLC → ACG Materials → ACG Materials-Alva**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Charles W  Harrison Jr → ACG Materials-Alva; 1950-01-01 to 2014-07-14; source msha-controller-operator-history
- **operator_operates_mine:** ACG Materials → ACG Materials-Alva; 2012-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Harrison Jr → ACG Materials; 2012-03-16 to 2014-07-14; source msha-controller-operator-history
- **controller_controls_mine:** H I G Capital LLC → ACG Materials-Alva; 2014-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H I G Capital LLC → ACG Materials; 2014-07-15 to current/open; source msha-controller-operator-history