# Relationship history for MSHA mine 3610200

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime → Extec S6**

- 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 → Extec S6; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone and Lime → Extec S6; 2016-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime; 2016-12-13 to current/open; source msha-controller-operator-history