# Relationship history for MSHA mine 1519846

Current hierarchy: **William  Moore → NEV LLC → Advanced Restoration Technologies -1**

- 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:** Option Land Development LLC → Advanced Restoration Technologies -1; 2018-10-24 to 2023-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Richard C  Warner et al → Advanced Restoration Technologies -1; 2018-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard C  Warner et al → Option Land Development LLC; 2018-10-24 to 2023-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Gregory L  Higgins et al → Option Land Development LLC; 2018-10-24 to 2023-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Gerald D  DeRossett et al → Option Land Development LLC; 2018-10-24 to 2023-06-06; source msha-controller-operator-history
- **operator_operates_mine:** NEV LLC → Advanced Restoration Technologies -1; 2023-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Moore → Advanced Restoration Technologies -1; 2023-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Moore → NEV LLC; 2023-06-07 to current/open; source msha-controller-operator-history