# Relationship history for MSHA mine 2402462

Current hierarchy: **Phillip  Cox; Rebeca  Cox → Big Sky Masonry Stone Inc → South Shawmut Yard**

- 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:** Big Sky Masonry Stone Inc → South Shawmut Yard; 2006-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phillip  Cox  et al → South Shawmut Yard; 2006-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillip  Cox  et al → Big Sky Masonry Stone Inc; 2006-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rebeca  Cox  et al → Big Sky Masonry Stone Inc; 2006-08-18 to current/open; source msha-controller-operator-history