# Relationship history for MSHA mine 4703592

Current hierarchy: **Gary A  Jackson → Edward E Gillen Company → ISP Minerals Inc-Kremlin Plant**

- 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:** Gary A  Jackson → ISP Minerals Inc-Kremlin Plant; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Edward E Gillen Company → ISP Minerals Inc-Kremlin Plant; 2010-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Jackson → Edward E Gillen Company; 2010-08-09 to current/open; source msha-controller-operator-history