# Relationship history for MSHA mine 4701472

Current hierarchy: **Pavement Materials LLC → Todd's Redi Mix Concrete, LLC → Plant 7 Portable Screw 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Wissota Sand & Gravel Company → Plant 7 Portable Screw Plant; 1950-01-01 to 2001-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Wissota Sand & Gravel Company → Plant 7 Portable Screw Plant; 1950-01-01 to 2019-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Wissota Sand & Gravel Company → Wissota Sand & Gravel Company; 1950-01-01 to 2001-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Paul T  Ayres → Plant 7 Portable Screw Plant; 1998-06-09 to 2004-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Todd's Redi Mix Concrete, LLC → Plant 7 Portable Screw Plant; 2001-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul T  Ayres → Todd's Redi Mix Concrete, LLC; 2001-02-14 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Pavement Materials LLC → Plant 7 Portable Screw Plant; 2004-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pavement Materials LLC → Todd's Redi Mix Concrete, LLC; 2004-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** WSG Acquisition Corp → Plant 7 Portable Screw Plant; 2019-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** WSG Acquisition Corp → Wissota Sand & Gravel Company; 2019-10-31 to 2001-02-13; source msha-controller-operator-history