# Relationship history for MSHA mine 3102302

Current hierarchy: **Paul T  Ayres → ACE Industrial Sands LLC → ACE Portable Plant**

- 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

- **operator_operates_mine:** ACE Industrial Sands LLC → ACE Portable Plant; 2016-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul T  Ayres → ACE Portable Plant; 2016-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul T  Ayres → ACE Industrial Sands LLC; 2016-03-24 to current/open; source msha-controller-operator-history