# Relationship history for MSHA mine 3402101

Current hierarchy: **Richmond H  Hill III → Oklahoma Aztec Company Inc → Oklahoma Aztec-Konawa**

- 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:** Richmond H  Hill III → Oklahoma Aztec-Konawa; 1992-05-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Aztec Company Inc → Oklahoma Aztec-Konawa; 2010-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richmond H  Hill III → Oklahoma Aztec Company Inc; 2010-02-05 to current/open; source msha-controller-operator-history