# Relationship history for MSHA mine 4502996

Current hierarchy: **Leita Marvelle → Triangle Sand & Gravel Company Inc → U & I 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:** Leita Marvelle → U & I Quarry; 1978-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Sand & Gravel Company Inc → U & I Quarry; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leita Marvelle → Triangle Sand & Gravel Company Inc; 1983-04-01 to current/open; source msha-controller-operator-history