# Relationship history for MSHA mine 2101515

Current hierarchy: **Timothy W Mueller; Mori D Willemsen; Brian  Droege → Wm. Mueller & Sons, Inc. → #72 50 VE Pioneer Crusher**

- 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

- **operator_operates_mine:** Wm. Mueller & Sons, Inc. → #72 50 VE Pioneer Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Mueller et al → #72 50 VE Pioneer Crusher; 1950-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Mueller et al → Wm. Mueller & Sons, Inc.; 1950-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Brad G Droege Et Al → Wm. Mueller & Sons, Inc.; 1950-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Droege et al → #72 50 VE Pioneer Crusher; 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:** Mori D Willemsen 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