# Relationship history for MSHA mine 1601207

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

- 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:** Custom Aggregates & Grinding Inc → Custom Abrasives LLC; 1990-07-01 to 2001-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Stockstill  et al → Custom Abrasives LLC; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Stockstill  et al → Custom Aggregates & Grinding Inc; 1990-07-01 to 2001-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Huey  Stockstill  et al → Custom Aggregates & Grinding Inc; 1990-07-01 to 2001-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Custom Abrasives LLC → Custom Abrasives LLC; 2001-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Warren A  Michael → Custom Abrasives LLC; 2001-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren A  Michael → Custom Abrasives LLC; 2001-12-01 to current/open; source msha-controller-operator-history