# Relationship history for MSHA mine 2602769

Current hierarchy: **Sterling Infrastructure Inc; Richard H  Buenting → Road and Highway Builders LLC. → Lower Valley 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Sterling Infrastructure Inc et al → Lower Valley Quarry; 2009-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Road and Highway Builders LLC. → Lower Valley Quarry; 2014-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling Infrastructure Inc et al → Road and Highway Builders LLC.; 2014-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Buenting et al → Road and Highway Builders LLC.; 2014-09-30 to current/open; source msha-controller-operator-history