# Relationship history for MSHA mine 4202810

Current hierarchy: **Donald N  Stratton → Interstate Rock Products Inc. → Hurricane Cliffs**

- 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:** Donald N  Stratton → Hurricane Cliffs; 1980-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Rock Products Inc. → Hurricane Cliffs; 2026-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald N  Stratton → Interstate Rock Products Inc.; 2026-06-22 to current/open; source msha-controller-operator-history