# Relationship history for MSHA mine 3003125

Current hierarchy: **Duane J  LaFever → DELAWARE BULLDOZING CORP. → EXTEC 5000**

- 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:** Delaware Bulldozing Corp. → EXTEC 5000; 1994-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George C  LaFever → EXTEC 5000; 1994-06-01 to 2020-11-30; source msha-controller-operator-history
- **controller_controls_operator:** George C  LaFever → Delaware Bulldozing Corp.; 1994-06-01 to 2020-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Duane J  LaFever → EXTEC 5000; 2020-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane J  LaFever → Delaware Bulldozing Corp.; 2020-12-01 to current/open; source msha-controller-operator-history