# Relationship history for MSHA mine 5100222

Current hierarchy: **Ken Beau  Kiyosaki → Kiyosaki Tractor Works Inc → Quarry 2 - Portable**

- 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:** Ken Beau  Kiyosaki → Quarry 2 - Portable; 1991-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kiyosaki Tractor Works Inc → Quarry 2 - Portable; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken Beau  Kiyosaki → Kiyosaki Tractor Works Inc; 1996-02-01 to current/open; source msha-controller-operator-history