# Relationship history for MSHA mine 3600250

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc. → Fairfield 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 → Fairfield Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → Fairfield Quarry; 1980-03-01 to 1983-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Fairfield Quarry; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company; 1980-03-01 to 1983-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Valley Quarries Inc → Fairfield Quarry; 1983-07-06 to 2010-08-04; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Valley Quarries Inc; 1983-07-06 to 2010-08-04; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Co., Inc. → Fairfield Quarry; 2010-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc.; 2010-08-05 to current/open; source msha-controller-operator-history