# Relationship history for MSHA mine 2302368

Current hierarchy: **David M.  Weinbaum → Melrose Quarry & Asphalt → Melrose Sand  and 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:** Arlington Aggregates → Melrose Sand  and Gravel; 2007-10-10 to 2009-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Brandt M  Webber → Melrose Sand  and Gravel; 2007-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brandt M  Webber → Arlington Aggregates; 2007-10-10 to 2009-03-31; source msha-controller-operator-history
- **controller_controls_mine:** David M.  Weinbaum → Melrose Sand  and Gravel; 2008-04-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Melrose Quarry & Asphalt → Melrose Sand  and Gravel; 2009-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M.  Weinbaum → Melrose Quarry & Asphalt; 2009-04-01 to current/open; source msha-controller-operator-history