# Relationship history for MSHA mine 2402262

Current hierarchy: **Quanta Services Inc → Northern Line Layers, Inc. → Neibauer 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:** Quanta Services Inc → Neibauer Pit; 1999-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Line Layers, Inc. → Neibauer Pit; 2002-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quanta Services Inc → Northern Line Layers, Inc.; 2002-03-01 to current/open; source msha-controller-operator-history