# Relationship history for MSHA mine 4503824

Current hierarchy: **Tom  Lenz → Lenz Enterprises, Inc. → Lenz Sand Hill 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

- **controller_controls_mine:** Tom  Lenz → Lenz Sand Hill Pit; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lenz Enterprises, Inc. → Lenz Sand Hill Pit; 2021-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Lenz → Lenz Enterprises, Inc.; 2021-06-29 to current/open; source msha-controller-operator-history