# Relationship history for MSHA mine 3600266

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc. → Union Furnace 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Union Furnace Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Warner Company → Union Furnace Quarry; 1950-01-01 to 1988-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Warner Company → Union Furnace Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warner Company → Warner Company; 1950-01-01 to 1988-12-20; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Co., Inc. → Union Furnace Quarry; 1988-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc.; 1988-12-21 to current/open; source msha-controller-operator-history