# Relationship history for MSHA mine 4103606

Current hierarchy: **Jimmy  Callahan → Sunshine Sand & Gravel Inc → SUNSHINE 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:** Sunshine Sand & Gravel Inc → SUNSHINE SAND & GRAVEL; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy  Callahan → SUNSHINE SAND & GRAVEL; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy  Callahan → Sunshine Sand & Gravel Inc; 1990-04-01 to current/open; source msha-controller-operator-history