# Relationship history for MSHA mine 0202846

Current hierarchy: **Chester  Scott at al → Mineral Aggregate Recycling Services Inc → Ehrenberg Wash Pit**

- 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

- **operator_operates_mine:** Mineral Aggregate Recycling Services Inc → Ehrenberg Wash Pit; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hodge Donald R → Ehrenberg Wash Pit; 1999-08-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hodge Donald R → Mineral Aggregate Recycling Services Inc; 1999-08-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Chester  Scott at al → Ehrenberg Wash Pit; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chester  Scott at al → Mineral Aggregate Recycling Services Inc; 2002-01-01 to current/open; source msha-controller-operator-history