# Relationship history for MSHA mine 1519580

Current hierarchy: **Frank  Parks → Frank Parks Contract Augering Inc → No 2**

- 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

- **controller_controls_mine:** Frank  Parks → No 2; 2011-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Frank Parks Contract Augering Inc → No 2; 2011-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Parks → Frank Parks Contract Augering Inc; 2011-04-18 to current/open; source msha-controller-operator-history