# Relationship history for MSHA mine 4406044

Current hierarchy: **William W  Cooke → Aylett Sand & Gravel Inc → Aylett Sand & Gravel / Old Hall**

- 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:** Aylett Sand & Gravel Inc → Aylett Sand & Gravel / Old Hall; 1983-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William W  Cooke → Aylett Sand & Gravel / Old Hall; 1983-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William W  Cooke → Aylett Sand & Gravel Inc; 1983-12-01 to current/open; source msha-controller-operator-history