# Relationship history for MSHA mine 3607515

Current hierarchy: **Fred  Bacher; Randy  Bacher → F R B Inc → Zundel Strip**

- 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:** F R B Inc → Zundel Strip; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Bacher et al → Zundel Strip; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Bacher et al → F R B Inc; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Bacher et al → F R B Inc; 1983-11-01 to current/open; source msha-controller-operator-history