# Relationship history for MSHA mine 4104580

Current hierarchy: **Bobby C  Smith → Green Rock Company Inc. → Green Rock Company Inc. - Garrison**

- 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:** Bobby C  Smith → Green Rock Company Inc. - Garrison; 1997-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Rock Company Inc. → Green Rock Company Inc. - Garrison; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby C  Smith → Green Rock Company Inc.; 2006-03-01 to current/open; source msha-controller-operator-history