# Relationship history for MSHA mine 1700862

Current hierarchy: **Leonard W  Nason → Granite Works, LLC → Stinchfield 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:** Granite Works, LLC → Stinchfield Quarry; 2010-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard W  Nason → Stinchfield Quarry; 2010-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard W  Nason → Granite Works, LLC; 2010-06-23 to current/open; source msha-controller-operator-history