# Relationship history for MSHA mine 2601065

Current hierarchy: **Dresser Industries Inc → Dresser Magcobar Minerals → Slaven 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:** Elquist Mining Inc → Slaven Mine; 1950-01-01 to 1983-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Elquist James M & John D Et Al → Slaven Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elquist James M & John D Et Al → Elquist Mining Inc; 1950-01-01 to 1983-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Dresser Magcobar Minerals → Slaven Mine; 1983-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dresser Industries Inc → Slaven Mine; 1983-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dresser Industries Inc → Dresser Magcobar Minerals; 1983-02-11 to current/open; source msha-controller-operator-history