# Relationship history for MSHA mine 4702731

Current hierarchy: **Wieser Concrete Products Inc → Wieser Sand & Gravel Inc → Small'S Gravel Pit**

- 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:** Wieser Sand & Gravel Inc → Small'S Gravel Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wieser Concrete Products Inc → Small'S Gravel Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wieser Concrete Products Inc → Wieser Sand & Gravel Inc; 1981-06-01 to current/open; source msha-controller-operator-history