# Relationship history for MSHA mine 4503735

Current hierarchy: **Eric S  Lenz → North Idaho Drilling Inc. → Crusher #2**

- 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:** Chad  Renner → Crusher #2; 2007-07-19 to 2015-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Eric S  Lenz → Crusher #2; 2015-02-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Idaho Drilling Inc. → Crusher #2; 2015-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Renner → North Idaho Drilling Inc.; 2015-04-08 to 2015-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Eric S  Lenz → North Idaho Drilling Inc.; 2015-04-08 to current/open; source msha-controller-operator-history