# Relationship history for MSHA mine 2402316

Current hierarchy: **CRAIG R  BORIS; PATRICIA M  BORIS → American Stoneworks, LLC → Big Sky 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:** PATRICIA M  BORIS  ET AL → Big Sky Quarry; 2002-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Stoneworks, LLC → Big Sky Quarry; 2003-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** PATRICIA M  BORIS  ET AL → American Stoneworks, LLC; 2003-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRAIG R  BORIS  ET AL → American Stoneworks, LLC; 2003-03-14 to current/open; source msha-controller-operator-history