# Relationship history for MSHA mine 0202764

Current hierarchy: **Patti  Bush → Jim Bush Sand & Gravel → Portable Read Screen All**

- 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:** Jim Bush Sand & Gravel → Portable Read Screen All; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patti  Bush → Portable Read Screen All; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patti  Bush → Jim Bush Sand & Gravel; 1998-04-01 to current/open; source msha-controller-operator-history