# Relationship history for MSHA mine 1515521

Current hierarchy: **Moses Rick A → R & R Development Company Inc → No 2 Surface**

- 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

- **operator_operates_mine:** R & R Development Company Inc → No 2 Surface; 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moses Rick A → No 2 Surface; 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moses Rick A → R & R Development Company Inc; 1986-02-01 to current/open; source msha-controller-operator-history