# Relationship history for MSHA mine 3102352

Current hierarchy: **Lisa  Butner → Tri County Rock → L & B**

- 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:** Tri County Rock → L & B; 2022-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lisa  Butner → L & B; 2022-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lisa  Butner → Tri County Rock; 2022-12-14 to current/open; source msha-controller-operator-history