# Relationship history for MSHA mine 3603204

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co, Inc → MT CYDONIA SAND PLANT II**

- 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

- **operator_operates_mine:** Valley Quarries Inc → MT CYDONIA SAND PLANT II; 1950-01-01 to 2010-08-04; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → MT CYDONIA SAND PLANT II; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Valley Quarries Inc; 1950-01-01 to 2010-08-04; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone and Lime Co, Inc → MT CYDONIA SAND PLANT II; 2010-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co, Inc; 2010-08-05 to current/open; source msha-controller-operator-history