# Relationship history for MSHA mine 4105517

Current hierarchy: **Preston  McQuigg; James  Baenisch; Martha  DeVasher → United Sand & Gravel → United Sand & Gravel, LLC.**

- 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

- **operator_operates_mine:** United Sand & Gravel → United Sand & Gravel, LLC.; 2020-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Baenisch et al → United Sand & Gravel, LLC.; 2020-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Baenisch et al → United Sand & Gravel; 2020-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martha  DeVasher et al → United Sand & Gravel; 2020-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Preston  McQuigg et al → United Sand & Gravel; 2020-08-21 to current/open; source msha-controller-operator-history