# Relationship history for MSHA mine 0901057

Current hierarchy: **Dean  Addison → D & H Quarry Inc → D & H QUARRY**

- 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:** D & H Quarry Inc → D & H QUARRY; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dean  Addison → D & H QUARRY; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Addison → D & H Quarry Inc; 1990-09-01 to current/open; source msha-controller-operator-history