# Relationship history for MSHA mine 0203462

Current hierarchy: **Donald N  Stratton → Interstate Rock Products Inc → Fredonia Portable**

- 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 → Fredonia Portable; 1980-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Rock Products Inc → Fredonia Portable; 2022-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald N  Stratton → Interstate Rock Products Inc; 2022-10-03 to current/open; source msha-controller-operator-history