# Relationship history for MSHA mine 2103435

Current hierarchy: **Jay B  Ingalls → J B I Sand & Gravel LLC → Screen Plant**

- 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:** J B I Sand & Gravel LLC → Screen Plant; 2004-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jay B  Ingalls → Screen Plant; 2004-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay B  Ingalls → J B I Sand & Gravel LLC; 2004-06-07 to current/open; source msha-controller-operator-history