# Relationship history for MSHA mine 4703917

Current hierarchy: **Robert  Mayer; Roger  Thimm; Russ  Wondra → Wondra Construction Inc. → Weber Pit**

- 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:** Wondra Construction Inc. → Weber Pit; 2022-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russ  Wondra et al → Weber Pit; 2022-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russ  Wondra et al → Wondra Construction Inc.; 2022-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Thimm et al → Wondra Construction Inc.; 2022-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Mayer et al → Wondra Construction Inc.; 2022-02-03 to current/open; source msha-controller-operator-history