# Relationship history for MSHA mine 0600400

Current hierarchy: **Steven E Aiudi → Windham Materials LLC → Windham Materials LLC**

- 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:** Windham Sand & Stone Inc → Windham Materials LLC; 1950-01-01 to 2001-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Keith J  Nasin → Windham Materials LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith J  Nasin → Windham Sand & Stone Inc; 1950-01-01 to 2001-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Windham Materials LLC → Windham Materials LLC; 2001-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elmo  Aiudi et al → Windham Materials LLC; 2001-09-20 to 2018-11-20; source msha-controller-operator-history
- **controller_controls_operator:** Elmo  Aiudi et al → Windham Materials LLC; 2001-09-20 to 2018-11-20; source msha-controller-operator-history
- **controller_controls_mine:** Steven E Aiudi → Windham Materials LLC; 2018-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven E Aiudi → Windham Materials LLC; 2018-11-21 to current/open; source msha-controller-operator-history