# Relationship history for MSHA mine 4104572

Current hierarchy: **David E  Wittwer; Dan R  Wittwer → Seven Points Sand & Gravel Inc → Seven Points Plant #2**

- 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:** Danny G  Rice → Seven Points Plant #2; 1995-07-01 to 2006-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Seven Points Sand & Gravel Inc → Seven Points Plant #2; 2006-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan R  Wittwer et al → Seven Points Plant #2; 2006-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan R  Wittwer et al → Seven Points Sand & Gravel Inc; 2006-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Wittwer et al → Seven Points Sand & Gravel Inc; 2006-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny G  Rice → Seven Points Sand & Gravel Inc; 2006-02-07 to 2006-02-06; source msha-controller-operator-history