# Relationship history for MSHA mine 2200772

Current hierarchy: **Warren A  Michael → Custom Abrasives, LLC → Custom Abrasives Picayune 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

- **controller_controls_mine:** Warren A  Michael → Custom Abrasives Picayune Plant; 2001-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Custom Abrasives, LLC → Custom Abrasives Picayune Plant; 2006-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren A  Michael → Custom Abrasives, LLC; 2006-11-27 to current/open; source msha-controller-operator-history