# Relationship history for MSHA mine 1002010

Current hierarchy: **Brian  Hansen; Thomas  Treanor → Northwest Sand & Gravel Inc → Hansen 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:** Rockey  Sligar → Hansen Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northwest Company Inc → Hansen Pit; 2001-10-03 to 2005-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Rockey  Sligar → Northwest Company Inc; 2001-10-03 to 2005-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Northwest Sand & Gravel Inc → Hansen Pit; 2005-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Treanor et al → Hansen Pit; 2005-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Treanor et al → Northwest Sand & Gravel Inc; 2005-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Hansen et al → Northwest Sand & Gravel Inc; 2005-07-14 to current/open; source msha-controller-operator-history