# Relationship history for MSHA mine 3200133

Current hierarchy: **Warren  Austfjord → Mike Austfjord & Sons Inc → Crusher #1**

- 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:** Mike Austfjord & Sons Inc → Crusher #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Austfjord Allen → Crusher #1; 1950-01-01 to 2003-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Austfjord Allen → Mike Austfjord & Sons Inc; 1950-01-01 to 2003-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Warren  Austfjord → Crusher #1; 2003-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Austfjord → Mike Austfjord & Sons Inc; 2003-08-01 to current/open; source msha-controller-operator-history