# Relationship history for MSHA mine 2700568

Current hierarchy: **David A Keurulainen → Productive Power Excavating Inc → Sandvik QJ241-10750**

- 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:** David A Keurulainen → Sandvik QJ241-10750; 2023-08-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Productive Power Excavating Inc → Sandvik QJ241-10750; 2025-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A Keurulainen → Productive Power Excavating Inc; 2025-06-06 to current/open; source msha-controller-operator-history