# Relationship history for MSHA mine 4104001

Current hierarchy: **Gieger Gordon H → Qualitech Steel Corp → QUALITECH STEEL CORP IRON CARBID**

- 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

- **operator_operates_mine:** Qualitech Steel Corp → QUALITECH STEEL CORP IRON CARBID; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gieger Gordon H → QUALITECH STEEL CORP IRON CARBID; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gieger Gordon H → Qualitech Steel Corp; 1998-04-01 to current/open; source msha-controller-operator-history