# Relationship history for MSHA mine 2602174

Current hierarchy: **Steve  Wickman → Las Vegas Rock Inc → Rainbow Quarries**

- 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:** Las Vegas Rock Inc → Rainbow Quarries; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Kiddy et al → Rainbow Quarries; 1991-01-01 to 2015-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Kiddy et al → Las Vegas Rock Inc; 1991-01-01 to 2015-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wickman et al → Las Vegas Rock Inc; 1991-01-01 to 2015-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Wickman et al → Rainbow Quarries; 2015-02-11 to 2020-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wickman et al → Las Vegas Rock Inc; 2015-02-11 to 2020-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Schulte et al → Las Vegas Rock Inc; 2015-02-11 to 2020-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Wickman → Rainbow Quarries; 2020-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wickman → Las Vegas Rock Inc; 2020-07-09 to current/open; source msha-controller-operator-history