# Relationship history for MSHA mine 2301827

Current hierarchy: **Bauman Charles L → Bauman Oil & Materials Inc → Bauman Portable Plant**

- 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:** Bauman Charles L → Bauman Portable Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bauman Oil & Materials Inc → Bauman Portable Plant; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauman Charles L → Bauman Oil & Materials Inc; 1980-09-01 to current/open; source msha-controller-operator-history