# Relationship history for MSHA mine 0401915

Current hierarchy: **Brett A  Jones → Wayne J. Sand & Gravel Inc. → Wayne J. 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:** Wayne J. Sand & Gravel Inc. → Wayne J. Sand & Gravel Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brett A  Jones → Wayne J. Sand & Gravel Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett A  Jones → Wayne J. Sand & Gravel Inc.; 1950-01-01 to current/open; source msha-controller-operator-history