# Relationship history for MSHA mine 0202747

Current hierarchy: **Western States Stone Company Inc → Western States Stone Company → WEST 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

- **controller_controls_mine:** Western States Stone Company Inc → WEST QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western States Stone Company → WEST QUARRY; 1997-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Western States Stone Company Inc → Western States Stone Company; 1997-12-01 to current/open; source msha-controller-operator-history