# Relationship history for MSHA mine 4202679

Current hierarchy: **Kent  Butters → Towers Sand & Gravel, LLC → Stansbury Pit**

- 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:** Towers Sand & Gravel, LLC → Stansbury Pit; 2017-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kent  Butters → Stansbury Pit; 2017-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Butters → Towers Sand & Gravel, LLC; 2017-09-07 to current/open; source msha-controller-operator-history