# Relationship history for MSHA mine 3901556

Current hierarchy: **Stephen  J  Gessner → Gessner Welding Inc → Screen #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:** Gessner Welding Inc → Screen #1; 2010-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  J  Gessner → Screen #1; 2010-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  J  Gessner → Gessner Welding Inc; 2010-04-10 to current/open; source msha-controller-operator-history