# Relationship history for MSHA mine 4300808

Current hierarchy: **Michael  O'Neil → M&M EXCAVATING, INC. → O'NEIL SAND AND GRAVEL QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Michael  O'Neil → O'NEIL SAND AND GRAVEL QUARRY; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M&M Excavating, Inc. → O'NEIL SAND AND GRAVEL QUARRY; 2021-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  O'Neil → M&M Excavating, Inc.; 2021-10-29 to current/open; source msha-controller-operator-history