# Relationship history for MSHA mine 4608275

Current hierarchy: **Frederick J  Taylor → Princess Polly Anna Coal Inc → Polly Anna No 2 Mine (0)**

- 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:** Frederick J  Taylor → Polly Anna No 2 Mine (0); 1984-05-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Princess Polly Anna Coal Inc → Polly Anna No 2 Mine (0); 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick J  Taylor → Princess Polly Anna Coal Inc; 1993-03-01 to current/open; source msha-controller-operator-history