# Relationship history for MSHA mine 2100644

Current hierarchy: **Glen R Mathiowetz; Matt  Mathiowetz → M.R. Paving & Excavating, Inc. → Portable Screener**

- 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:** Wallner Construction Company Inc → Portable Screener; 1950-01-01 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  Wallner → Portable Screener; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Wallner → Wallner Construction Company Inc; 1950-01-01 to 1981-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Wallner Construction Company Inc → Portable Screener; 1981-10-01 to 1995-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Mobilcrete Inc → Portable Screener; 1981-10-01 to 1995-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Mobilcrete Inc → Wallner Construction Company Inc; 1981-10-01 to 1995-03-21; source msha-controller-operator-history
- **operator_operates_mine:** M.R. Paving & Excavating, Inc. → Portable Screener; 1995-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy C  Rahe → Portable Screener; 1995-03-22 to 2023-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Timothy C  Rahe → M.R. Paving & Excavating, Inc.; 1995-03-22 to 2023-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Glen R Mathiowetz et al → Portable Screener; 2023-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen R Mathiowetz et al → M.R. Paving & Excavating, Inc.; 2023-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Mathiowetz et al → M.R. Paving & Excavating, Inc.; 2023-02-01 to current/open; source msha-controller-operator-history