# Relationship history for MSHA mine 2103734

Current hierarchy: **Kenneth L  Lehman → Kenneth Lehman Logging → Lehman 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:** Kenneth Lehman Logging → Lehman Pit; 2011-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Lehman → Lehman Pit; 2011-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Lehman → Kenneth Lehman Logging; 2011-07-11 to current/open; source msha-controller-operator-history