# Relationship history for MSHA mine 3607770

Current hierarchy: **Kuzemchak Fred → Hamilton Brothers Coal Company Inc → Hamilton #1**

- 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:** Hamilton Brothers Coal Company Inc → Hamilton #1; 1986-12-01 to 1996-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Bob → Hamilton #1; 1986-12-01 to 1996-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Bob → Hamilton Brothers Coal Company Inc; 1986-12-01 to 1996-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Hamilton Brothers Coal Company Inc → Hamilton #1; 1996-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kuzemchak Fred → Hamilton #1; 1996-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kuzemchak Fred → Hamilton Brothers Coal Company Inc; 1996-07-23 to current/open; source msha-controller-operator-history