# Relationship history for MSHA mine 2302467

Current hierarchy: **Donald K  Pemberton → Bandera Stone, Inc. → Deerfield 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

- **controller_controls_mine:** Donald K  Pemberton → Deerfield Quarry; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bandera Stone, Inc. → Deerfield Quarry; 2014-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald K  Pemberton → Bandera Stone, Inc.; 2014-02-06 to current/open; source msha-controller-operator-history