# Relationship history for MSHA mine 3610296

Current hierarchy: **Linda J  Gustin; Paul R  Gustin → Gustin Stone Supply Inc. → Smith Quarry**

- 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:** Gustin Stone Supply Inc. → Smith Quarry; 2019-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul R  Gustin et al → Smith Quarry; 2019-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul R  Gustin et al → Gustin Stone Supply Inc.; 2019-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda J  Gustin et al → Gustin Stone Supply Inc.; 2019-06-05 to current/open; source msha-controller-operator-history