# Relationship history for MSHA mine 1401740

Current hierarchy: **Justin C  Wacker; Todd A  Wacker → Hi-Plains Sand, Inc. → 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

- **controller_controls_mine:** Robert L  Wacker et al → Quarry; 1981-10-22 to 2017-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Plains Sand, Inc. → Quarry; 2012-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Wacker et al → Hi-Plains Sand, Inc.; 2012-02-01 to 2017-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Wacker et al → Hi-Plains Sand, Inc.; 2012-02-01 to 2017-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Justin C  Wacker et al → Quarry; 2017-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin C  Wacker et al → Hi-Plains Sand, Inc.; 2017-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd A  Wacker et al → Hi-Plains Sand, Inc.; 2017-11-14 to current/open; source msha-controller-operator-history