# Relationship history for MSHA mine 3503545

Current hierarchy: **Brent  Kerr → Kerr Contractors, Inc. → Goble 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Kerr Contractors, Inc. → Goble Quarry; 2001-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Kerr → Goble Quarry; 2001-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Kerr → Kerr Contractors, Inc.; 2001-10-17 to current/open; source msha-controller-operator-history