# Relationship history for MSHA mine 3606729

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company Inc → BROCKWAY 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:** New Enterprise Stone & Lime Company Inc → BROCKWAY QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Russell Quinn Company → BROCKWAY QUARRY; 1978-03-09 to 1991-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Russell  Quinn → BROCKWAY QUARRY; 1978-03-09 to 1991-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Russell  Quinn → Russell Quinn Company; 1978-03-09 to 1991-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Keystone Sand & Gravel Inc → BROCKWAY QUARRY; 1991-05-28 to 1997-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Gerard P  Auman → BROCKWAY QUARRY; 1991-05-28 to 1997-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Gerard P  Auman → Keystone Sand & Gravel Inc; 1991-05-28 to 1997-11-24; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Company Inc → BROCKWAY QUARRY; 1997-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company Inc; 1997-11-25 to current/open; source msha-controller-operator-history