# Relationship history for MSHA mine 4602188

Current hierarchy: **Bayer William D → Northern Star Coal Inc → Northern Star No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Double Jacks Coal Company → Northern Star No 1 Mine; 1950-01-01 to 1972-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Double Jacks Coal Company → Northern Star No 1 Mine; 1950-01-01 to 1972-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Double Jacks Coal Company → Double Jacks Coal Company; 1950-01-01 to 1972-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Francis David L → Northern Star No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Development Company → Northern Star No 1 Mine; 1972-06-02 to 1975-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Francis David L → Interstate Development Company; 1972-06-02 to 1975-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Bayer William D → Northern Star No 1 Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Price William Pflug Mining Inc → Northern Star No 1 Mine; 1975-01-02 to 1975-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Price-William-Pflug Mining Inc → Northern Star No 1 Mine; 1975-01-02 to 1975-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Price-William-Pflug Mining Inc → Price William Pflug Mining Inc; 1975-01-02 to 1975-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Northern Star Coal Inc → Northern Star No 1 Mine; 1975-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bayer William D → Northern Star Coal Inc; 1975-02-14 to current/open; source msha-controller-operator-history