# Relationship history for MSHA mine 3609527

Current hierarchy: **Enrique E  Vasquez → Vasquez Stone → Hiduk Quarry**

- 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:** Cassel Brick Flagstone → Hiduk Quarry; 2007-05-30 to 2008-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Cynthia L  Brink → Hiduk Quarry; 2007-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cynthia L  Brink → Cassel Brick Flagstone; 2007-05-30 to 2008-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Vasquez Stone → Hiduk Quarry; 2008-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Enrique E  Vasquez et al → Hiduk Quarry; 2008-05-06 to 2010-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Enrique E  Vasquez et al → Vasquez Stone; 2008-05-06 to 2010-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Mario B  Vasquez et al → Vasquez Stone; 2008-05-06 to 2010-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Enrique E  Vasquez → Hiduk Quarry; 2010-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Enrique E  Vasquez → Vasquez Stone; 2010-10-08 to current/open; source msha-controller-operator-history