# Relationship history for MSHA mine 1401559

Current hierarchy: **Justin C  Wacker; Todd A  Wacker → Hi-Plains Sand Inc → Hi-Plains Sand 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Gary L  Wacker et al → Hi-Plains Sand Pit; 1981-10-22 to 2017-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Pfannenstiel et al → Hi-Plains Sand Pit; 1990-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hays Asphalt Construction Inc → Hi-Plains Sand Pit; 1992-01-01 to 1994-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Pfannenstiel et al → Hays Asphalt Construction Inc; 1992-01-01 to 1994-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Rich  Dinkel et al → Hays Asphalt Construction Inc; 1992-01-01 to 1994-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Plains Sand Inc → Hi-Plains Sand Pit; 1994-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Wacker et al → Hi-Plains Sand Inc; 1994-10-31 to 2017-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Wacker et al → Hi-Plains Sand Inc; 1994-10-31 to 2017-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Justin C  Wacker et al → Hi-Plains Sand Pit; 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