# Relationship history for MSHA mine 2300759

Current hierarchy: **David M.  Weinbaum → Melrose Quarry & Asphalt Co. LLC. → Melrose 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

- **operator_operates_mine:** William A Mc Dowell Company → Melrose Quarry; 1950-01-01 to 1983-04-20; source msha-controller-operator-history
- **controller_controls_mine:** William A Mc Dowell Company → Melrose Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A Mc Dowell Company → William A Mc Dowell Company; 1950-01-01 to 1983-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Quarry & Materials Inc → Melrose Quarry; 1983-04-21 to 2008-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Alice  Mc Dowell → Melrose Quarry; 1983-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alice  Mc Dowell → Southwest Quarry & Materials Inc; 1983-04-21 to 2008-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Melrose Quarry & Asphalt Co. LLC. → Melrose Quarry; 2008-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M.  Weinbaum → Melrose Quarry; 2008-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M.  Weinbaum → Melrose Quarry & Asphalt Co. LLC.; 2008-04-25 to current/open; source msha-controller-operator-history