# Relationship history for MSHA mine 2602010

Current hierarchy: **Mc Namara John → Angst Inc → Gold Bar Mine**

- 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:** Columbus Mines Inc → Gold Bar Mine; 1987-05-01 to 1987-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Holabird Fred N → Gold Bar Mine; 1987-05-01 to 1987-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Holabird Fred N → Columbus Mines Inc; 1987-05-01 to 1987-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Angst Inc → Gold Bar Mine; 1987-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Namara John → Gold Bar Mine; 1987-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Namara John → Angst Inc; 1987-11-30 to current/open; source msha-controller-operator-history