# Relationship history for MSHA mine 1507119

Current hierarchy: **Bart  Mulzer → Evansville Materials Inc → No 9 Dredge**

- 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:** Evansville Materials Inc → No 9 Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bart  Mulzer et al → No 9 Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bart  Mulzer et al → Evansville Materials Inc; 1950-01-01 to current/open; source msha-controller-operator-history