# Relationship history for MSHA mine 0202087

Current hierarchy: **Wilkins Arnold → Total Mine Services → Polly Ann**

- 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:** Total Mine Services → Polly Ann; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilkins Arnold Et Al → Polly Ann; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilkins Arnold Et Al → Total Mine Services; 1982-02-01 to current/open; source msha-controller-operator-history