# Relationship history for MSHA mine 4201113

Current hierarchy: **Shannon  Sorensen → Sorensen Sand & Gravel → Sorensen Sand & Gravel**

- 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

- **operator_operates_mine:** Sorensen Sand & Gravel Company → Sorensen Sand & Gravel; 1950-01-01 to 1983-03-15; source msha-controller-operator-history
- **controller_controls_mine:** L Jay  Sorensen → Sorensen Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L Jay  Sorensen → Sorensen Sand & Gravel Company; 1950-01-01 to 1983-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Sorensen Sand & Gravel → Sorensen Sand & Gravel; 1983-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shannon  Sorensen → Sorensen Sand & Gravel; 1983-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shannon  Sorensen → Sorensen Sand & Gravel; 1983-03-16 to current/open; source msha-controller-operator-history