# Relationship history for MSHA mine 2602460

Current hierarchy: **Steve  Wickman → Las Vegas Rock Inc → SCREENING PLANT**

- 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:** Steve  Wickman et al → SCREENING PLANT; 1991-01-01 to 2015-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Las Vegas Rock Inc → SCREENING PLANT; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wickman et al → Las Vegas Rock Inc; 2001-03-01 to 2015-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Kiddy et al → Las Vegas Rock Inc; 2001-03-01 to 2015-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Wickman et al → SCREENING PLANT; 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 → SCREENING PLANT; 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