# Relationship history for MSHA mine 3600234

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company Inc → SPROUL LIME & STONE**

- 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 → SPROUL LIME & STONE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sproul Lime & Stone Company → SPROUL LIME & STONE; 1950-01-01 to 1999-03-07; source msha-controller-operator-history
- **controller_controls_mine:** John E  Claar → SPROUL LIME & STONE; 1950-01-01 to 1999-03-07; source msha-controller-operator-history
- **controller_controls_operator:** John E  Claar → Sproul Lime & Stone Company; 1950-01-01 to 1999-03-07; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Company Inc → SPROUL LIME & STONE; 1999-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company Inc; 1999-03-08 to current/open; source msha-controller-operator-history