# Relationship history for MSHA mine 4703945

Current hierarchy: **Jason P  McKeefry → McKeefry & Sons, Inc. → Portable Kleemann Crusher**

- 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

- **controller_controls_mine:** Jason P  McKeefry et al → Portable Kleemann Crusher; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McKeefry & Sons, Inc → Portable Kleemann Crusher; 2023-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason P  McKeefry et al → McKeefry & Sons, Inc; 2023-08-02 to current/open; source msha-controller-operator-history