# Relationship history for MSHA mine 4702749

Current hierarchy: **Zeman Victor → Zeman Construction & Concrete Company Inc → Algoma Pit**

- 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

- **controller_controls_mine:** Zeman Victor → Algoma Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Krueger Construction Company Inc → Algoma Pit; 1982-10-01 to 1986-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Krueger Melvin J → Algoma Pit; 1982-10-01 to 1986-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Krueger Melvin J → Krueger Construction Company Inc; 1982-10-01 to 1986-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Zeman Construction & Concrete Company Inc → Algoma Pit; 1986-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeman Victor → Zeman Construction & Concrete Company Inc; 1986-08-20 to current/open; source msha-controller-operator-history