# Relationship history for MSHA mine 1001999

Current hierarchy: **Larry P  Scrivanich → Snake River Quartzite → MIDDLE MT. QUARRIES**

- 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:** Larry P  Scrivanich → MIDDLE MT. QUARRIES; 1997-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Snake River Quartzite → MIDDLE MT. QUARRIES; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry P  Scrivanich → Snake River Quartzite; 2001-04-01 to current/open; source msha-controller-operator-history