# Relationship history for MSHA mine 2200652

Current hierarchy: **William T  Evans → Evans Sand & Gravel Inc → EVANS SAND & GRAVEL, INC.**

- 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:** Evans Sand & Gravel Inc → EVANS SAND & GRAVEL, INC.; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William T  Evans → EVANS SAND & GRAVEL, INC.; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William T  Evans → Evans Sand & Gravel Inc; 1993-07-01 to current/open; source msha-controller-operator-history