# Relationship history for MSHA mine 2601594

Current hierarchy: **Kalkbrenner William → Imperial Milling Inc → Imlay 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:** International Trade & Investments Ltd → Imlay Mine; 1980-02-01 to 1985-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Jensen Alan Et Al → Imlay Mine; 1980-02-01 to 1985-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Jensen Alan Et Al → International Trade & Investments Ltd; 1980-02-01 to 1985-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Wm (Bill) Dale → Imlay Mine; 1985-05-29 to 1985-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Dale Bill → Imlay Mine; 1985-05-29 to 1985-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Dale Bill → Wm (Bill) Dale; 1985-05-29 to 1985-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Imlay Corp → Imlay Mine; 1985-10-02 to 1993-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Lichtenstein Immanuel → Imlay Mine; 1985-10-02 to 1993-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Lichtenstein Immanuel → Imlay Corp; 1985-10-02 to 1993-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Imperial Milling Inc → Imlay Mine; 1993-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kalkbrenner William → Imlay Mine; 1993-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kalkbrenner William → Imperial Milling Inc; 1993-03-03 to current/open; source msha-controller-operator-history