# Relationship history for MSHA mine 3606860

Current hierarchy: **New Enterprise Stone & Lime Company Inc → NEW ENTERPRISE STONE & LIME CO., INC. → TOLAND SAND PLANT**

- 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 → TOLAND SAND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Max J  Hempt → TOLAND SAND PLANT; 1950-01-01 to 2021-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Hempt Brothers Inc → TOLAND SAND PLANT; 1979-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Max J  Hempt → Hempt Brothers Inc; 1979-01-01 to 2021-04-30; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → TOLAND SAND PLANT; 2021-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Hempt Brothers Inc; 2021-05-01 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Co., Inc. → TOLAND SAND PLANT; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc.; 2022-01-01 to current/open; source msha-controller-operator-history