# Relationship history for MSHA mine 2103964

Current hierarchy: **Timothy W Mueller; Mori D Willemsen; Brian  Droege → WM MUELLER & SONS INC → #164 TRACK SCREEN MACHINE**

- 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:** Brad G Droege Et Al → #164 TRACK SCREEN MACHINE; 1950-01-01 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** WM MUELLER & SONS INC → #164 TRACK SCREEN MACHINE; 2020-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad G Droege Et Al → WM MUELLER & SONS INC; 2020-02-19 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Mueller et al → WM MUELLER & SONS INC; 2020-02-19 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mori D Willemsen et al → #164 TRACK SCREEN MACHINE; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mori D Willemsen et al → WM MUELLER & SONS INC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Droege et al → WM MUELLER & SONS INC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy W Mueller et al → WM MUELLER & SONS INC; 2022-01-01 to current/open; source msha-controller-operator-history