# Relationship history for MSHA mine 4202159

Current hierarchy: **Steve L  Gilbert → Gilbert Development Corporation → SR9/Harrisburg 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:** Steve L  Gilbert → SR9/Harrisburg Pit; 1985-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilbert Development Corporation → SR9/Harrisburg Pit; 1996-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Gilbert → Gilbert Development Corporation; 1996-12-01 to current/open; source msha-controller-operator-history