# Relationship history for MSHA mine 2100491

Current hierarchy: **Duininck Companies → Duininck Concrete, LLC → New London Materials**

- 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

- **operator_operates_mine:** Central Allied Enterprises Inc → New London Materials; 1950-01-01 to 2004-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Central Allied Enterprises Inc → New London Materials; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Central Allied Enterprises Inc → Central Allied Enterprises Inc; 1950-01-01 to 2004-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Duininck Concrete, LLC → New London Materials; 2004-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duininck Companies → New London Materials; 2004-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duininck Companies → Duininck Concrete, LLC; 2004-01-26 to current/open; source msha-controller-operator-history