# Relationship history for MSHA mine 3003712

Current hierarchy: **Town of Salisbury-NY → Town of Salisbury Highway Dept → Town of Salisbury-Sand & Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Town of Salisbury Highway Dept → Town of Salisbury-Sand & Gravel Pit; 2009-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Town of Salisbury-NY → Town of Salisbury-Sand & Gravel Pit; 2009-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town of Salisbury-NY → Town of Salisbury Highway Dept; 2009-09-10 to current/open; source msha-controller-operator-history