# Relationship history for MSHA mine 3601025

Current hierarchy: **Echnoz Leon L → L & E Construction & Equipment Company Inc → L & E Strips**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** L & E Construction & Equipment Company Inc → L & E Strips; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Echnoz Leon L → L & E Strips; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Echnoz Leon L → L & E Construction & Equipment Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history