# Relationship history for MSHA mine 3303936

Current hierarchy: **Smith Daniel J & Ronald L → Regal Mining Inc → Blum-Noble 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:** Regal Mining Inc → Blum-Noble Mine; 1983-05-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Selway → Blum-Noble Mine; 1983-05-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Selway → Regal Mining Inc; 1983-05-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Regal Mining Inc → Blum-Noble Mine; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel J & Ronald L → Blum-Noble Mine; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel J & Ronald L → Regal Mining Inc; 1987-04-01 to current/open; source msha-controller-operator-history