# Relationship history for MSHA mine 4406616

Current hierarchy: **Stephen D  Halsey; Carl A  Hamilton → Wolverine Coal Company Inc → #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Carl A  Hamilton et al → #1 Mine; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry W  Maggard → #1 Mine; 1990-03-30 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** J & L Coal Inc → #1 Mine; 1990-11-01 to 1991-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Maggard → J & L Coal Inc; 1990-11-01 to 1991-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Wolverine Coal Company Inc → #1 Mine; 1991-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl A  Hamilton et al → Wolverine Coal Company Inc; 1991-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen D  Halsey et al → Wolverine Coal Company Inc; 1991-04-05 to current/open; source msha-controller-operator-history