# Relationship history for MSHA mine 3502325

Current hierarchy: **Sanders Sid → Sanders Excavating → Hatch 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sanders Excavating → Hatch Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sanders Sid → Hatch Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders Sid → Sanders Excavating; 1950-01-01 to current/open; source msha-controller-operator-history