# Relationship history for MSHA mine 3401298

Current hierarchy: **Estell Thomas L → Quickway Excavating Company Inc → Quickway 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Quickway Excavating Company Inc → Quickway Pit; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Estell Thomas L Et Al → Quickway Pit; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estell Thomas L Et Al → Quickway Excavating Company Inc; 1980-11-01 to current/open; source msha-controller-operator-history