# Relationship history for MSHA mine 0301922

Current hierarchy: **Perry N  Davis; Bobby N  Davis → Davis Stone → Davis Stone**

- 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:** Davis Stone → Davis Stone; 2005-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby N  Davis et al → Davis Stone; 2005-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby N  Davis et al → Davis Stone; 2005-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perry N  Davis et al → Davis Stone; 2005-11-16 to current/open; source msha-controller-operator-history