# Relationship history for MSHA mine 4702970

Current hierarchy: **Kenneth  Kuhn → Kuhn Gravel & Concrete Service → KUHN PIT**

- 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:** Kuhn Gravel & Concrete Service → KUHN PIT; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Kuhn → KUHN PIT; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Kuhn → Kuhn Gravel & Concrete Service; 1993-03-01 to current/open; source msha-controller-operator-history